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The Best Innova 3340 of 2023 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best Innova 3340 of 2023. Check our ranking below.

2,649 Reviews Scanned

Rank No. #1

Innova 3340 Professional Automotive Digital Multimeter, Black

Designed to pinpoint engine problems; tests alternator diodes, duty cycle, solenoids, breaker points, wiring, switches and more
Features auto-ranging, auto shut-off and over-load protection
Measures up to 15 amps for device testing
10 MegOhm input impedance; safe for electrical and automotive use; prevents damage to the vehicle’s ECU
Includes temperature probe, inductive RPM clamp and carrying case

Rank No. #2

INNOVA 3320 Auto-Ranging Digital Multimeter, Red & Black

UL certified product designed to safely and accurately troubleshoot a variety of automotive and household electrical problems
Auto-ranging scales automatically selects correct measurement range and eliminate the need to dial in the correct range when making electronic measurements
Features large digital display and color coded LED's to easily check the charge status of batteries
Single-setting resistance function for AC and DC voltage
10 MegOhm input impedance; safe for electrical and automotive use; prevents damage to the vehicle’s ECU

Rank No. #3

Hermitshell Hard Travel Case for INNOVA 3320/3340 Auto-Ranging Digital Multimeter

Hermitshell Hard Travel Storage Carrying Case
Protect your favorite device from bumps dents and scratches
Made to fit INNOVA 3320/3340 Auto-Ranging Digital Multimeter.
Material:EVA ; Color: Black+Red Zipper; Inner size:5.5*3.2*2(L*H*W) inch
For sale is case only (device and accessories are sold separately)

Rank No. #4

Innova 3300 Hands-Free Digital Multimeter Black

UL certified product designed to safely and accurately troubleshoot a variety of automotive and household electrical problems.Fit Type: Universal Fit
10 MegOhm circuitry prevents damage to sensitive automotive electronics
Household uses include: outlets, fuses, wiring, general-purpose batteries, electronic hobbies and more
Automotive uses include: automotive circuits, breakers, wiring, vehicle battery & charging systems, electrical components and more
Includes wrist-mounted band, stand and lead holders for hands-free testing

Rank No. #5

Aenllosi Hard Case Replacement for Fits INNOVA 3320/3340 Auto-Ranging Digital Multimeter (red)

Aenllosi Storage Organizer Hard Carrying Tool Case replacement for INNOVA Auto-Ranging Digital Multimeter Voltage Tester Tool fits model # 3300 3320 3340
Features: Case is made of supreme quality, durable EVA, crush resistant, anti-shock, water resistant material provides adequate protection from bumps, scratches and splashes
With Internal mesh pocket can store other accessories at your convenience
Internal size: 5.75*3.75*2.25 inch, external size:6.25*4.25*2.5 inch, weight:120g.
For sale is case only, device and accessories are not included.

Rank No. #6

Mchoi Hard Portable Case Fits for INNOVA 3320/3340 Digital Multimeter, Case Only Black

High grade EVA condition:This hard portable case is made of high quality EVA to provide durable and a long-lasting performance!
Perfect fit:We have specially designed the case to suit your INNOVA 3320/3340 /AstroAI AM33D Digital Multimeter!
Fashion look: This case features a sharp fashion look!
100% Safe:The case is semi waterproof, shockproof, stylish and durable. Classic zipper design makes opening and closing easy and simple!
After-sale Service: Only the innova multimeter empty case is sold, the innova 3320/3340 multimeter are not included. If you are not satisfied with the products you received, please let us know. We will solve the problem for you as soon as possible.

SaleRank No. #7

KAIWEETS Digital Multimeter with Case, DC AC Voltmeter, Ohm Volt Amp Test Meter and Continuity Test Diode Voltage Tester for Household Outlet, Automotive Battery Test (Anti-Burn with Double Fuses)

Customer Service: KAIWEETS provides a lifetime after sale service and technical support. This digital multimeter is included with 2 AAA batteries (pre-installed), comes with a carrying case and 2 decent cable leads.
Multi-Function: This multimeter can test AC/DC Voltage, DC current (Can not for AC current), Resistance, Continuity, Diode Measurement.
Sensitive Test: Please make sure the rotary switch is located at the right test range. Data hold function, backlight function helps you test clearly and quickly in a dim place.
Safety Operation: IEC Rated CAT III 600V, CE and RoHS certified. Anti-Burn with double fuses. This multimeter has overload protection on all ranges.
Widely Used: The Digital Multimeter is designed to be safe and accurate, and suitable for electrician test, household use, automotive, industrial electrical problems.

Rank No. #8

Innova 5610 OBD2 Bidirectional Scan Tool - Understand Your Vehicle, Pinpoint What's Wrong, and Complete Your Repairs with Less Headache. Free Updates. Free US-Based Technical Support.

MAINTAIN PEAK PERFORMANCE AND SAFETY ON THE ROAD - Easily find and fix the problem with your vehicle using the INNOVA 5610 bi-directional scan tool. Get real-time solutions to troubleshoot your automotive issues and access OBD2 and OEM live data.
PRO-LEVEL FUNCTIONALITIES - Use INNOVA 5610’s Enhanced Data Stream to view live data for advanced systems like ABS, SRS, transmission, and engine. The Special Reset Function lets you use dealership-level re-learn procedures to complete repairs.
COMMAND WITH BIDIRECTIONAL CONTROLS - The INNOVA 5610 bidirectional control and scan tool sends commands to your vehicle to test functions such as fuel pump on/off, A/C clutch on/off, or retract the electronic parking brake.
EASY TO USE - The INNOVA 5610 OBD2 scanner diagnostic tool is easy to operate and supports English, Spanish, and French. Use the auto-relink on any foreign or domestic 1996 or newer OBD2 car, light truck, SUV, or hybrid vehicle to verify repairs.
BUY AND DRIVE WITH CONFIDENCE - Our California-based, ASE-Certified Customer Support Team will assist you as you navigate through the product. Pair seamlessly with the RepairSolutions2 app to access wireless OBD2 live information and solutions. Free updates are included with no subscription fees required. Each product is tested internally and externally as this product is durable to impact.

SaleRank No. #9

AstroAI Digital Multimeter TRMS 4000 Counts with DC AC voltmeter and Auto-Ranging Fast Accurately Measures Voltage, Current, Resistance, Capacitance, Temperature, Continuity, Frequency and Duty-Cycle.

Digital Multimeter:WIDE RANGE of tests for AC/DC Voltage, AC/DC Current, Resistance, Continuity, Capacitance, Frequency and Temperature; Tests Diodes.
Voltage Tester:PROFESSIONAL LEVEL features include Auto-Ranging capability, and True RMS for measuring both AC Current and Voltage.
Easy to Use: Convenient features like Data Hold, Large LCD Backlit Screen, Kickstand, and Low Battery Indicator make taking and recording measurements easier than ever before.
Capacitance & Resistance Meters:IDEAL FOR COMMERCIAL settings where it can handle the demands of a long workday, from the durable exterior to the wide range of heavy-duty capabilities.
Additional Tips：This Multimeter is designed to troubleshoot a variety of automotive and household electrical problems safely and accurately. It’s a suitable tool if you want to do some household or commercial improvements whether DIYers or Hobbyists. Combined with Amazon's excellent delivery, we provide lifetime technical support.

SaleRank No. #10

AstroAI Multimeter Tester 2000 Counts Digital Multimeter with DC AC Voltmeter and Ohm Volt Amp Meter ; Measures Voltage, Current, Resistance; Tests Live Wire, Continuity

VERSATILE DIGITAL MULTIMETER - Accurately measures AC/DC Voltage, DC Current, Resistance, and Diode. This Multimeter is a really useful tool for solving industrial and household electrical issues. Suitable for Household Outlets, Fuses, Batteries (including Vehicles), Automotive Circuit Troubleshooting, Charging System, Testing electronics in Cars etc.
TROUBLESHOOTING WITH ACCURACY - This Multimeter has a sampling speed of 2 times per second; Built-in a backlight LCD display with 3 ½ digits (1999 count) 0.6”, and high polarity including negative and positive readings.
ENSURES SAFETY - Double ceramic fuse is anti-burn and protects from overloading.The silicone cover is able to protect the multimeter from failing damage and prevent electric shocks. And low battery indication will be displayed when battery power is low.
EASE OF USE - Support Data Hold, low battery indicator and continuity buzzer. Includes Convenient feature like LCD Backlit Screen makes it easy to use in dimly light areas. Battery/Set of Test Leads/User Manual are Included.
ADDITIONAL TIPS - This Multimeter is designed to troubleshoot a variety of automotive and household electrical problems safely and accurately. It’s a suitable tool if you want to do some household or commercial improvements whether DIYers or Hobbyists. (NOTE: This meter can not test AC Current; Ensure your multimeter is set to the correct setting before testing)

Rank No. #11

AUTOOL DM303 Digital Multimeter, Oscilloscope Auto-Ranging TRMS, Voltage and Current, Resistance, Frequency, Continuity, car ECU Detection, K line and CAN Bus Signal, Injector Test, Sensor Signal

【More Powerful Detection Range】The multimeter can accurately measure AC/DC voltage, resistance, continuity, AC/DC current, capacitance, frequency, diodes, duty cycle and fire wire. DC voltage 0 ~ 1000V, AC voltage 0 ~ 700V, DC/AC Current 0 ~ 20A, 0 ~ 200mA, Resistance 0 ~ 1MΩ, Frequency 1 ~ 1MHZ, Continuity circuit test and ignition signal test to meet all test requirements.
【Oscilloscope Fuction】Waveform test bandwidth of 500KHZ, using variable sampling frequency, can measure slowly changing signal, suitable for automotive maintenance to measure and observe various signal quantities on automotive circuits, including motor drive signals, motor power voltage on electric vehicles, ignition signals, camshaft signals, crankshaft signals, wheel speed sensor signals, oxygen sensor signals, etc. of fuel car engines.
【Auto Range & Ture RMS】Simply select the mode and connect your leads. The multimeter will automatically select the appropriate measurement depending on what it detects. With True RMS, the DM301 portable multimeter provides you with the clear, accurate readings whenever and wherever you need them.
【Wiring Functions】Equipped with 8 wiring lines for different functions. They are multi-function test line, battery clip line, ignition pulse signal test line, car circuit test line, jumper and multimeter probe. The multi-function test line is used to test the battery voltage, test the fuel injector and relay, test the K-wire and CAN bus signal, test the car ECU, and test the car parts.
【2.8 inch Colorful Screen】Color display screen with backlight for clear reading. Built-in flashlight for dark environments. Adjustable screen brightness, button sound and sleep time to meet your various needs and various working environments, making your measurements more convenient.

Rank No. #12

KAIWEETS HT118E Digital Multimeter TRMS 20000 Counts with Higher Resolution Auto-Ranging Voltmeter Accurately Measures Voltage Current Resistance Diodes Continuity Duty-Cycle Capacitance Temperature

HIGHER RESOLUTION & ADVANCED DESIGN - 20000 counts, HT118E multimeter with more resolution bits allows for more accurate measurement results. The flashlight on the back ensures easy use in dimly lit places. Min/Max to record signal fluctuations. Stable kickstand, Pen slot on the back, Low battery prompt, Data retention, Auto power-off.
MULTIFUNCTION - Accurately measures AC/DC Voltage, AC/DC Current, Resistance, HT118E voltage tester also measures Temperature, Capacitance, Frequency, Duty-cycle, Diodes, Continuity, and NCV, Live with sound and light alarm. Suitable for Household Outlets, Fuses, Batteries (including Vehicles), Automotive Circuit Troubleshooting, Charging Systems, Testing electronics in Cars, etc.
EASE OF USE - Switch the dial to the function you need, and the LED lights on the jacks will shine accordingly, helping you place the probes into the correct position and plug in the leads easily. Autoranging saves you the hassle of having to know which range of value. The LCD backlight display offers easy-to-read digits.
SAFETY ABOVE ALL - IEC Rated CAT III 1000V, CAT IV 600V, CE, RoHS, FCC certified. Anti-Burn with double ceramic fuse and thermistor protection circuit. High Voltage Protection is active on all ranges. Double insulated unit. Silicone protective cover prevents the multimeter from falling damage and electric shocks. Low battery indication will be displayed when battery power is low.
SINCERE SERVICES - KAIWEETS provides a 36-Month after-sale service and lifetime technical support. Please feel free to contact us if you have any concerns. The package includes a multimeter, test leads, thermocouples, batteries, a user manual, and a durable case.

Rank No. #13

Mucar CDE900 OBD2 Scanner, Engine Fault Car Code Reader with Full OBD2 Functions, for All OBDII Protocol Cars Since 1996, Support to Expand 4 Systems Diagnostic Tool, Black

✅Mucar CDE900 OBD2 scanner software system will be updated frequently. For better user experience, it is recommended that you update the software to the latest version after receiving the product before using it.
✅Upgradable to System Diagnostic: Upgrade your CDE900 scanner to diagnose ABS, SRS, Transmission, and Engine systems. Pay once, and enjoy lifetime upgrades. (✅Note: Upgrading to more features requires an additional $39.95. Pay once, life free.)
✅Full OBD2 Functions:Mucar CDE900 OBD2 scanner offers complete OBD2 functions, including Read Codes, Erase Codes, Live Data, and more. Get accurate diagnostics for your car.
✅Pass Smog Check with Ease: Check the status of emission-related monitors, misfire system, and fuel system with Mucar CDE900. Pass the Smog Check easily and save money.
✅Powerful Hardware: Equipped with Android 7.0, 16G Larger Memory(expandable to 64G), 1500mAH Battery, and a 4-inch touch-sensitive screen, CDE900 works with all vehicles that are OBD2 protocols.

Rank No. #14

Klein Tools MM325 Multimeter, Digital Manual-Ranging 600V AC/DC Voltage Tester, Tests Batteries, Current, Resistance, Diodes, and Continuity

VERSATILE FUNCTIONALITY: Measures AC/DC voltage up to 600V, 10A DC current, 2MΩ resistance; additional features include continuity, diode test and battery test
LEAD-ALERT PROTECTION: LEDs on the meter illuminate to indicate proper test lead placement, enhancing accuracy and safety during measurements
BACKLIT DISPLAY: LCD shows clear readings in low-light conditions for enhanced visibility
BATTERY TEST: Battery test mode can be used for checking if batteries are working
CONVENIENT FEATURES: Test lead holders on the back of the meter, kickstand and optional magnetic hanger (Cat. Nos. 69445 or 69417) for hands-free operation

Rank No. #15

Innova 3347 Digital Multimeter AMP Probe Red

Ideal for testing alternator output, starter and battery current draw and all other electrical wiring circuits
Operating range 0-600 AMP AC/DC
Features 2-foot test lead, slide switch for measurement selection and zero adjuster for calibration
Red/Green indicator light shows power and low battery
Designed to work with all Digital Multimeters

SaleRank No. #16

AstroAI Multimeter Tester, TRMS 4000 Counts Volt Meter Auto-Ranging Ohmmeter Digital 1.5v/9v/12v Battery Voltage Tester Measure Voltage Current Resistance Diodes Continuity Capacitance with NCV

WIDE APPLICATIONS - The AstroAI M4K0R Multimeter accurately measures AC/DC voltage to 600V, Current to 10A, Resistance to 40MΩ. You can use it for continuity test, diode test, battery test and live wire test. Includes 1.5V, 9V and 12V battery test modes to easily test a wide variety of batteries. Multimeter light turns red for low voltage and green for enough voltage.
NON-CONTACT - Fully safe non-contact voltage testing with sound and light alarms. You can detects AC voltage without the use of test leads. Uses NCV function：When the Meter senses a strong AC signal, the red indicator light will turn on and the buzzer will emit a quick beep.
THOUGHTFUL DESIGN - Support Data Hold, Max, Auto Shut-off, low battery indicator and continuity buzzer. Includes Convenient features like Audial and Visual Alarm, LCD Backlit Screen and Flashlight make it easy to use. Two 1.5V AAA batteries are included in the package.
ENSURES SAFETY - Double ceramic fuse is anti-burn and protects from overloading. The multimeter has passed overvoltage category III 600V safety standards. The silicone cover is able to protect the multimeter from failing damage and prevent electric shocks.
ADDITIONAL TIPS - This Multimeter is designed to troubleshoot a variety of automotive and household electrical problems safely and accurately. It’s a suitable tool if you want to do some household or commercial improvements whether DIYers or Hobbyists. Combined with Amazon's excellent delivery, we provide lifetime technical support.

Rank No. #17

Digital Multimeter for Voltage, Resistance, Current, Continuity, Battery and Diode Multi Tester with Probes, Test Clips, Dupont Wires, Crocodile Clips, Mini Wire Stripper from Plusivo

Wide Range of Applications: can measure AC and DC voltage, resistance, and current, It can also test circuit continuity, battery quality, and diode biases; a must have addition to all your electrical and electronic tools for industrial and household use
High Quality Display with Backlight Function: features a high quality 3 ½ digits display with maximum display value of 1999 with automatic polarity display; with backlight to conveniently see the values in dimly lit areas
Features Hold function that retains the last measured value, a kick-stand, silicone cover for protection; low battery indicator icon displayed when battery power is low; easy to use and operate
Comes with Additional Items: set of test leads, normal and needle types of probes, test clips, dupont wire probes, crocodile clips, mini crocodile cable, thermocouples, mini wire stripper tool, mini screwdrivers, an electrical tape, user guide
Satisfaction Guarantee: with 30-day manufacturer’s guarantee and lifetime customer support for customer’s satisfaction; suitable tool for your DIY, household and electrical applications

Rank No. #18

Digital Multimeter Voltage Tester, Assark 2000 Counts Multimeter Measure AC DC Voltage DC Current, Meter Tester Test Volt Ohm Amp Diode Continuity,Resistance,Backlit LCD Display,Data Hold Function

【Entry-Level Digital Multimete】 Measure AC/DC Voltage, DC Current, Resistance, Circuit Continuity Test, Battery Check, Diode Test. Works as a voltmeter, ammeter, ohmmeter, car battery tester, Ampere Meters, voltage tester. It is good for home use, school and DIY-beginner!
【LCD Display& Data Hold Function】This Multimeter has a sampling speed of 2 times per second; Built-in a backlight LCD display with 3 ½ digits (1999 count) 0.6”,It is easy to read measure data in dimly light areas.Data Hold Function is good for recording the data.
【Built in Audible Continuity Test Voltmeter】Buzzer will work if the resistance is lower than 50Ω, There will be a " beep "sound.Compared with other voltage meter, It will be a good indicator! It it more convenient.
【Strong Protective Shell with Stand Built】 Digital multimeters can be hand held or stood using its fold out stand. Removable thick rubber cover is made of kind of non-slip slightly soft plastic that will help with drop protection & minor bumps protection.
【Complete Package】With everything you need, Digital multimeter includes ‎1*digital multimeter;2*1.5AA battery;1*Probe Test Leads;1* user manual. As a electronic beginner, it is enough for meeting your demands!

Rank No. #19

AIOMEST AI-770M Digital Multimeter Tester, DMM Measures AC/DC Current Volt Ohm Amp Resistance Continuity Diodes Capacitor Transistor hFE with Auto Backlight, Multitester Case

【VERSATILE MULTIMETER】 The meter has comprehensive electrical features to assist in professional work such as measuring of DC & AC voltage/current, resistance, capacitor, frequency, duty cycle, temperature, transistor hFE; detection of Non Contact AC Voltage (NCV) , positive diode voltage fall and audible continuity.
【INTELLIGENT LCD INDICATION】 6000 counts crystal clear LCD built with backlight sensor for automatically lighting up the screen in a relative dim or dark condition without needing to press on any button. Knob lighting is synchronized with automatic backlight for easy operating.
【HANDING MAGNET & KICKSTAND】 Set your hands free by attaching to the metal surface while detecting. Kickstand design on the back offers convenient placing, flexible and adjustable vision angles which allows you obtain the data at a glance.
【HIGH ACCURACY】 Featuring high accuracy±0.8% of rdg + 2 digits (DC 1000V); ±1.5% of rdg + 3 digits (AC 750V); ±1.5% of rdg + 3 digits (Resistance 60MΩ). The AN-770M Multimeter meets the need of all electrical measuring aspects.
【DURABLE & SAFE】 Anti-dropping rubber design prevent the digital engine tester from accidentally falling. Worry-free use with overload protection. ANNMETER also offers 12 months warranty and life-long technical support, shop with confidence!

SaleRank No. #20

Fluke 117 Digital Multimeter, Non-Contact AC Voltage Detection, Measures Resistance/Continuity/Frequency/Capacitance/Min Max Average, Automatic AC/DC Voltage Selection, Low Impedance Mode

VoltAlert technology for non-contact voltage detection
AutoVolt automatic AC/DC voltage selection. DC millivolts - Range : 600.0 mV, Resolution : 0.1 mV
Low input impedance: helps prevent false readings due to ghost voltage
Large white LED backlight to work in poorly lit areas
True RMS for accurate measurements on non-linear loads.Operating temperature:-10°C to +50°C.Battery life:400 hours typical, without backlight

Last update on 2023-08-13 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

How Do You Buy The Best Innova 3340?

Do you get stressed out thinking about shopping for a great Innova 3340? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching Innova 3340, which is why we have assembled a comprehensive list of the greatest Innova 3340 available in the current market. We’ve also come up with a list of questions that you probably have yourself.

We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Innova 3340 that you consider buying. Your questions might include the following:

Is it worth buying an Innova 3340?
What benefits are there with buying an Innova 3340?
What factors deserve consideration when shopping for an effective Innova 3340?
Why is it crucial to invest in any Innova 3340, much less the best one?
Which Innova 3340 are good in the current market?
Where can you find information like this about Innova 3340?

We’re convinced that you likely have far more questions than just these regarding Innova 3340, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Innova 3340, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Innova 3340. Make sure that you are only using trustworthy and credible websites and sources.

We provide an Innova 3340 buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Innova 3340 currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

Brand Value: Every brand of Innova 3340 has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
Features: What bells and whistles matter for an Innova 3340?
Specifications: How powerful they are can be measured.
Product Value: This simply is how much bang for the buck you get from your Innova 3340.
Customer Ratings: Number ratings grade Innova 3340 objectively.
Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Innova 3340.
Product Quality: You don’t always get what you pay for with an Innova 3340, sometimes less, and sometimes more.
Product Reliability: How sturdy and durable an Innova 3340 is should be an indication of how long it will work out for you.

We always remember that maintaining Innova 3340 information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Innova 3340 is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly! We’re here for you all the time. Contact us here. Or You can read more about us to see our vision.

FAQ:

Q: What do you need to know about Innova 3340?

A: The Innova 3340 is a digital multimeter aimed at automotive technicians. Its features are designed to quickly find engine problems. Overall, it comes with a wide range of measurement features, including temperature measurements, diode measurements, tacho check, and RPM measurements. It is CAT-II rated and UL-certified.

Q: Which is better the Innova 3340 or the fluke 115?

A: They’ll both survive a good drop. The biggest difference in their outward design is that the Fluke 115 has a slimmer, ergonomic feel and can be used one-handed. If you’re a car technician looking for a digital multimeter, the Innova 3340 is as close to a no-brainer as you’ll get.

Q: Is the Innova 3340 multimeter as accurate as a dedicated voltmeter?

A: While not as accurate as a dedicated voltmeter – where DC voltage tends towards <±0.1% – it has many functions for the price and a decent level of accuracy for general purpose electrics. The INNOVA 3340 multimeter is strong and contoured and has a protective rubber boot.

Q: Which is the best Innova multimeter for your car?

A: The INNOVA 3340 Automotive Digital Multimeter is the pros choice for a high-quality multimeter. The pro quality features help pinpoint engine problems while the 10 MegOhm impedance prevents damage to the ECU. It Includes temperature probe to measure temperature in both Celsius and Fahrenheit.