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Best diagnostic test measurement tools - June 2026

Last Updated - June 22, 2026

1
Best Choice
32% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

GEARWRENCH
32% Off

GEARWRENCH Professional Bi-Directional Diagnostic Scan Tool | GWSMARTBT

GEARWRENCH

$102.59

$149.99
(32% Off)

More Details
Main highlights
- Supports 23 vehicle reset/relearn functions, including throttle matching, ABS bleeding, TPMS reset, etc.
- OE-Level diagnostics on your smart device
- Live data mapping and freeze frame capturing
- Full bi-directional control, live actuation test
- FREE Software updates - No subscriptions, no fees – EVER
$102.59
$149.99 (32% Off)
2

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

FOXWELL

FOXWELL NT301 OBD2 Scanner Live Data Professional Mechanic OBDII Diagnostic Code Reader Tool for Check Engine Light

FOXWELL

$69.99

More Details
Main highlights
- 【What It DOES NOT Do – Be Fully Informed Before Purchasing】This is a basic OBD2 code reader, not a professional scan tool. It does NOT support: ABS, SRS, EPB, A/C systems etc, ; Any special resets (TMS reset/SRS Reset/ABS bleeding/automatic driving/tpms relearn/bluetooth related). Please check compatibility before purchasing—functionality varies by year, make, model, and VIN.
- 【Vehicle CEL Doctor】The NT301 obd2 scanner enables you to read DTCs, access to e-missions readiness status, turn off CEL(check engine light) or MIL, reset monitor, read live data and retrieve VIN of your vehicle. The fault code will appear again even though you cleared before, if you don't repair the car completely. The fault code only can be cleared by NT301 after car repair finished, as like all the obd2 scanner's working principle.
- 【S-mog Check Helper – Know Your Readiness Status at a Glance】With dedicated I/M readiness hotkeys and a simple Red-Yellow-Green LED indicator, you’ll instantly know if your vehicle is ready for em-issions testing. Built-in speaker provides audio feedback. No guesswork—just confidence before you head to the test center.
- 【Read Fault Codes】About the read code funtion needs to be in the ignition on state and if the check engine light is on. If the vehicle is compatible with NT301, please select correct menu & ensure no hardware/wiring issues/obd2 interface damage for accurate results. The correct menu: Select OBDII-> Wait for seconds-> Select Read codes.
- 【OBDII Protocols & Compatibility】 The NT301 supports OBDII protocols like KWP2000, J1850 VPW, ISO9141, J1850 PWM and CAN. The device is compatible with 1996 US-based, 2000 EU-based and Asian cars, light trucks, SUVs. Kindly check the vehicle compatibility before the purchase since the function comatibility and car compatibility vary from different car models, year and vin.
- 【Live Data Graphing & Accuracy for Most OBD2 Vehicles】View and log live sensor data in graph form—monitor oxygen sensors, fuel trims, coolant temp, RPM, and more. Spot trends and suspicious values in real time. Compatible with most 1996+ gasoline cars, light trucks, and SUVs sold in the U.S., as well as many 2000+ European and Asian models. Also works on 12V diesel vehicles equipped with OBD2. It's a basic code reader and DOESN'T't support to scan ABS, SRS, EPB, A/C systems etc, . It also DOESN'T support ANY special functions like TMS reset/SRS Reset/ABS bleeding/automatic driving/tpms relearn/bluetooth related.
- 【Lifetime Updates + 1-Year Seller Assurance】Enjoying plug and play and peace of mind with our 1-year seller assurance. No need to update before use. If you receive a damaged, used, or incomplete unit, we’ll replace it or issue a full refund. If you’re not satisfied and choose to return it, please mark it as “unsellable” so it won’t be resold to another customer—we appreciate your honesty.
- 【Advanced OBDII Modes 】 This car scanner provides enhanced obd2 modes capabilities: O-2 sensors test and EVAP system leak monitor. It allows you to run a leak check on your car’s EVAP system and assess the fuel tank’s condition. The O-2 sensor test helps optimize the air-fuel ratio, boosting fuel economy and cutting em-issions. Saving you money on gas and reducing your vehicle’s environmental footprint.
- 【A Must-Have Tool for Every Home Mechanic】Compact, rugged, and ready to use right out of the box. The 2.8” color screen is easy to read, even in daylight. No charging or setup required—just plug into the 16-pin DLC and start diagnosing. Recommended by professional mechanics on YouTube and trusted by DIYers worldwide.
$69.99
3
18% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

YAMHOHO
18% Off

Goniometer 12 inch 360° Clear Protractor Physical Therapy, for Medical Range of Motion Measurement Angle Ruler and Protractors Bulk for Classroom

YAMHOHO

$4.09

$4.99
(18% Off)

More Details
Main highlights
- TRANSPARENT FOR EASY READINGS - The clear plastic of the goniometer allows you to place the device directly on a joint or limb for easy observation.
- Package: you will get 1 piece 360 degrees goniometer 12 inch, it can help we assist in physical therapy by determining the range of motion of a joint; It is a kind of equipment that is always available at home
- EASILY DETERMINE RANGE OF MOTION - A goniometers primary purpose is to assist in physical therapy by determining the range of motion of a joint. It's an easy way to gauge recovery after surgery or physical therapy.
- CLEAR ISOM DESIGN - The easy to read 360° head features three scales to allow for a variety of readings. The arm's ruler features both inches and centimeters.
- AN ESSENTIAL TOOL FOR TREATMENT - A goniometer is an essential tool for anyone who works in or is going through physical therapy, sports therapy, or a rehab program following surgery or an accident.
$4.09
$4.99 (18% Off)
4
Best Value
40% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

ANCEL
40% Off

ANCEL AD310 Classic Enhanced Universal OBD II Scanner Car Engine Fault Code Reader CAN Diagnostic Scan Tool, Read and Clear Error Codes for 1996 or Newer OBD2 Protocol Vehicle (Black)

ANCEL

$23.99

$39.99
(40% Off)

More Details
Main highlights
- The AD310 only supports the diagnosis of emission-related issues. If the engine fault is unrelated to the emission system, it cannot read the engine fault codes. The AD310 only supports use with the OBDII interface. If your vehicle has an OBDI interface, diagnosis cannot be performed even if an OBDII adapter is used.
- Sturdy and Compact: Equipped with a 2.5 foot cable made of very thick, flexible insulation. It is important to have a sturdy scanner as it can easily fall to the ground when working in a car. The AD310 OBD2 scanner is a well-constructed mechanic tool with a sleek design. It weighs 12 ounces and measures 8.9 x 6.9 x 1.4 inches. Thanks to its compact design and light weight, transporting the device is not a problem. The buttons are clearly labelled and the screen is large and displays results clearly.
- OBDII Protocols and Car Compatibility: Many cheap scan tools do not really support all OBD2 protocols. AD310 scanner as it can support all OBDII protocols such as KWP2000, J1850 VPW, ISO9141, J1850 PWM and CAN. This device also has extensive vehicle compatibility with 1996 US-based, 2000 EU-based and Asian cars, light trucks, SUVs, as well as newer OBD2 and CAN vehicles both domestic and foreign. Pls confirm with our customer service whether it is compatible with your vehicle before purchasing.
- Home Necessity and Worthy to Own: This is an excellent code reader to travel or home with as it weighs less and it is compact in design. You can easily slide it in your backpack as you head to the garage, or put it on the dashboard, this will be a great fit for you. The AD310 is not only portable, but also accurate and fast in performance. Moreover, it covers various car brands and is suitable for people who just need a code reader to check their car.
- CEL Doctor: The ANCEL AD310 is one of the best-selling OBD II scanners on the market and is recommended by Scotty Kilmer, a YouTuber and auto mechanic. It can easily determine the cause of the check engine light coming on. After repairing the vehicle's problems, it can quickly read and clear diagnostic trouble codes of emission system, read live data & hard memory data, view freeze frame, I/M monitor readiness and collect vehicle information.
- Accurate Fast and Easy to Use: The AD310 scanner can help you or your mechanic understand if your car is in good condition, provides exceptionally accurate and fast results, reads and clears engine trouble emission codes in seconds after you fixed the problem. This device will let you know immediately and fix the problem right away without any car knowledge. No need for batteries or a charger, get power directly from the OBDII Data Link Connector in your vehicle.
$23.99
$39.99 (40% Off)
5

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Ezyaid

Ezyaid PD Ruler with Instruction Manual - Pupillary Distance Ruler for Pupil Distance Measuring, PD Measurement Tool for Prescription Eyeglasses, Include Eye Care Tips

Ezyaid

$6.95

More Details
Main highlights
- What You Get: 1 plastic PD stick ruler for Pupillary Distance (PD) measurement, 1 special well-made instruction manual, and eye care tips
- Markings on Both Sides of Ruler: convenient and comfortable to use with either your right or your left hand, can also be used to measure eyeglass frame for lens replacement
- Instruction Manual Included: Ezyaid PD ruler packaged with well-made instruction manual, no need to look for how to use the PD elsewhere, save lots of your time and energy
- Ezyaid Care Your Eyes: Instruction manual include eye care tips on how to reduce the risk for myopia in children
- Easy to Use: Straight edge with nose bridge design, well positioned and perfectly match on nose making the PD measurement easily and accurately, helping to get more precise values for single PD or dual PD of each eye
$6.95

Best diagnostic test measurement tools - June 2026

GEARWRENCH Professional Bi-Directional Diagnostic Scan Tool | GWSMARTBT

FOXWELL NT301 OBD2 Scanner Live Data Professional Mechanic OBDII Diagnostic Code Reader Tool for Check Engine Light

Goniometer 12 inch 360° Clear Protractor Physical Therapy, for Medical Range of Motion Measurement Angle Ruler and Protractors Bulk for Classroom

ANCEL AD310 Classic Enhanced Universal OBD II Scanner Car Engine Fault Code Reader CAN Diagnostic Scan Tool, Read and Clear Error Codes for 1996 or Newer OBD2 Protocol Vehicle (Black)

Ezyaid PD Ruler with Instruction Manual - Pupillary Distance Ruler for Pupil Distance Measuring, PD Measurement Tool for Prescription Eyeglasses, Include Eye Care Tips

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