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Source: https://autoboss.com/product/mrcartool-h90-spark-plug-tester-tool-dual-hole/
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Reviews·19

5.0 / 5Based on 19 reviews
4 ★0%
3 ★0%
2 ★0%
1 ★0%
Ellis S.

Great value for the price and excellent quality! I received the product just three days after purchasing, and the shipping was incredibly fast. The speed is fully adjustable, making it perfect for testing long spark plugs. An essential spark plug tester for every workshop!

Ivan M.

Every time I have used it, it has worked correctly. It has identified spark plugs that are faulty even though they are new.

Tammy S.

The MRCARTOOL H90 spark plug tester tests both spark plugs simultaneously, is compatible with multiple sizes, and features adjustable spark plug height for maximum flexibility. It’s even compatible with long spark plugs from BMW and Audi. The battery clip design makes it highly portable, and the high-definition screen provides clear visuals. It’s plug-free and ready to use anytime, anywhere, with accurate RPM display. Simple and reliable operation – highly recommended!

Specifications

BrandMRCARTOOL
Weight600 g
DimensionsN/A
Test SocketsDual, 10/12/14/16/18mm spark plugs
Simulated Speed500 to 9000rpm, digital adjustable
Socket HeightAdjustable, supports BMW, VW, Audi long spark plugs
Power SupplyBattery clamps directly to 12V battery (also stated as 110V/220V input in comparison chart)
Operating Temperature0 to 45°C
Weight0.6 kg
Compatibility12V gasoline vehicle spark plugs

Details

Compare Two Spark Plugs Side by Side Under Simulated Engine Speeds

The H90 fires two spark plugs at once so you can compare their ignition strength while simulating real engine conditions, with the simulated RPM shown on a digital display. It is intended for spark plugs from 12V gasoline vehicles.

  • Dual Test Sockets
  • 500–9000 RPM
  • Height-Adjustable Sockets
  • Battery Clamp Power
  • Digital Display

Key Features

  1. Dual-Socket Testing

    Test two spark plugs simultaneously to quickly identify a faulty plug.

  2. Adjustable Socket Height

    Accepts standard spark plugs as well as the longer plugs used in BMW, Volkswagen and Audi vehicles.

  3. Battery Clamp Connection

    No power outlet needed; connect the clamps directly to the battery.

  4. Digital RPM Control

    Turn the knob to set the simulated speed and read the value on the display; different speeds represent different working conditions.

Highlights

Two spark plugs firing in the MRCARTOOL H90 dual test sockets
Two Plugs at Once

Each socket has its own signal lamp for side-by-side comparison.

H90 with a long and a standard spark plug in height-adjusted sockets
Long and Standard Plugs

Raise the socket to fit longer spark plugs.

H90 connected to a 12V battery with red and black clamps
Powered From the Battery

Red and black clamps connect the tester to a 12V battery.

H90 digital display showing the simulated engine speed
Speed on Display

The digital readout shows the simulated RPM as you adjust it.

Basic Version vs H90

Basic Version H90
Simulated RPM 0–6000 rpm 500–9000 rpm
HD digital display No Yes
Battery clip design No Yes
Adjustable socket height No Yes
Long spark plug testing No Yes
Safety protection cover Yes No

What’s in the Box

  • H90 main unit
  • Battery clamp cable
  • User manual
MRCARTOOL H90 main unit, battery clamp cable, retail box and user manual
H90 package contents.

How to Use

  1. Fit the plugsAdjust the socket height and insert each spark plug into a test socket.
  2. Connect the clampsAttach the red clamp to the positive terminal and the black clamp to the negative terminal.
  3. Switch onTurn the switch and observe how the spark plugs work.
  4. CompareAdjust the simulated RPM and compare the plugs under different working conditions.

Good to Know

Caution
  • Spark plug voltage reaches tens of thousands of volts during operation; never touch the plugs while testing.
  • Switch off the power before inserting or removing a spark plug.

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Offers

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Offers are applied at checkout according to the store rules.

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Delivery

Ships in 1-3 business days

Warehouses

  • US Warehouse
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Choose the warehouse in the specifications.

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Service

  • Secure checkout

    Payments are processed over an encrypted connection.

  • After-sales support

    Contact us for installation or usage questions.

Specifications

Brand
MRCARTOOL
Weight
600 g
Dimensions
N/A
Test Sockets
Dual, 10/12/14/16/18mm spark plugs
Simulated Speed
500 to 9000rpm, digital adjustable
Socket Height
Adjustable, supports BMW, VW, Audi long spark plugs
Power Supply
Battery clamps directly to 12V battery (also stated as 110V/220V input in comparison chart)
Operating Temperature
0 to 45°C
Weight
0.6 kg
Compatibility
12V gasoline vehicle spark plugs

Reviews19

5.0 / 5Based on 19 reviews
4 ★0
3 ★0
2 ★0
1 ★0
Ellis S.

Great value for the price and excellent quality! I received the product just three days after purchasing, and the shipping was incredibly fast. The speed is fully adjustable, making it perfect for testing long spark plugs. An essential spark plug tester for every workshop!

Ivan M.

Every time I have used it, it has worked correctly. It has identified spark plugs that are faulty even though they are new.

Tammy S.

The MRCARTOOL H90 spark plug tester tests both spark plugs simultaneously, is compatible with multiple sizes, and features adjustable spark plug height for maximum flexibility. It’s even compatible with long spark plugs from BMW and Audi. The battery clip design makes it highly portable, and the high-definition screen provides clear visuals. It’s plug-free and ready to use anytime, anywhere, with accurate RPM display. Simple and reliable operation – highly recommended!

Elton D.

Quality of product is ok Product box exist Packaging is ok

Barlow T.

Handy little spark tester easy to use and having 2 plug sockets allows me to check and old spark plug against a new one side by side.

Godfery G.

I am glad I finally got one of these. Check your spark plugs on the bench, with no pain. We had always just tried to check them on the motor. They usually wouldn’t sit where they would be grounded and you’d wind up holding them in place while you cranked and that would cause some intense pain when you became the ground too. But that would only tell you if they were sparking. With this you can not only know if their sparking but you can see how good the spark is and see how it acts at different rpms. Prove to yourself side gapping spark plugs actually works. I’m enjoying having this in the shop.

Vera W.

In the past doing my own mechanic work, if I even suspected a spark plug might be failing I would just simply replace it. I had no way of checking the spark plug itself with proper equipment. So when this little guy arrived I was quite excited. After doing some testing on various spark plugs, new and old, it performed beautifully. You can literally tell which plugs are becoming faulty and the machine is very accurate. Also love the fact that it can test not only the shorter plugs but the longer plugs as well. I would venture to say that this testing machine would not only work great in a DIY environment, but a professional mechanic’s environment as well.

Grant N.

That this device is really necessary in order to know the good condition of the engine plugs.

Tim H.

This spark plug tester is the most suitable device I’ve purchased. Its dual-hole design improves efficiency, and the adjustable socket is compatible with both standard and extended luxury car plugs. No power source is needed—just connect to a battery. The data is clear and easy to read, and customer service responds very quickly. I would recommend this device if you need a spark plug tester.

Wallis C.

Affordable price and good quality! I received the goods on the third day after purchasing. The speed is freely adjustable, making it very useful for testing long spark plugs. An essential spark plug tester for every workshop!

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MRCARTOOL H90 Dual-Hole Spark Plug Tester with 500-9000 RPM Digital Adjustment
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MRCARTOOL H90 Spark Plug Tester Tool Dual Hole
MRCARTOOL H90 Dual-Hole Spark Plug Tester with 500-9000 RPM Digital Adjustment

Original price was: US$50.00.Current price is: US$30.00.

Select options This product has multiple variants. The options may be chosen on the product page