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Reviews·11

4.9 / 5Based on 11 reviews
3 ★0%
2 ★0%
1 ★0%
Ethan P.

I really appreciate that it can test long spark plugs, and the test probe height is adjustable. It features a backlit screen and a protective cover—the features aren’t flashy, but they’re all quite practical.

Emma W.

Having three test sockets is quite convenient—you can place the spark plugs side by side for comparison instead of having to swap them back and forth one by one. The RPM is also adjustable, making it easier to check the ignition.

Chuluun

AUTOOL SPT301 Car Spark Tester Automotive Diagnostic

AUTOOL SPT301 Car Spark Tester Automotive Diagnostic

Specifications

BrandAUTOOL
Weight500 g
Stations3 sockets: 1 reference spark plug + 2 under test
Simulated Speed200–9000 rpm adjustable
DisplayBacklit LCD digital speed
Socket HeightAdjustable, supports long spark plugs
Power SupplyAC 110V / 220V ±10% input, DC12V output adapter
Ambient Temperature0-45°C
Dimensions200 × 118 × 118 mm
Weight500 g
CompatibilityCommon 12V car spark plugs and motorcycle spark plugs

Details

Compare Two Spark Plugs Against a Known Reference

The SPT301 fires one reference plug and two test plugs side by side under a transparent cover at an adjustable 200–9000 rpm simulated rate. Results are a relative in-air comparison, not proof of spark performance under cylinder pressure or load.

  • 1 Reference + 2 Test Plugs
  • 200–9000 rpm
  • LCD Speed Display
  • Long-Plug Support

Key Features

  1. Reference Comparison

    Fire a new or known-good plug next to two test plugs for a direct visual comparison of spark strength.

  2. Adjustable Firing Rate

    Set the simulated rate from 200 to 9000 rpm with the + and − buttons and compare all plugs at the same displayed setting.

  3. Adjustable Socket Height

    Socket height adjusts to accept longer spark plug ends.

  4. Transparent Safety Cover

    Watch spark behavior through the cover while reducing direct spark exposure.

  5. Grouped Controls

    Test holes, cover, display and buttons sit together on one compact bench unit.

Model Comparison

SPT301 SPT101 SPT105 SPT360
Test positions 3 2 2 5
Simulated speed 200–9000 rpm 0–6000 rpm 0–6000 rpm 200–9000 rpm
Adjustable height / long plugs Yes No Yes Yes
LCD backlit display Yes No No Yes

What’s in the Box

  • SPT301 spark plug tester
  • Power adapter
  • User manual
  • Retail box
AUTOOL SPT301 spark plug tester with retail box, user manual and power adapter
Package contents as shown by the manufacturer. Spark plugs are not included.

How to Use

  1. Place the plugsWith power off, fit the reference plug in the standard hole and the plugs to be tested in the test holes.
  2. Close the coverLower the protective cover before testing.
  3. Power onPlug the adapter into the side power socket, connect power and switch on.
  4. Adjust and observeSet the rate with + and − and compare the sparks through the cover.

Height and speed adjustment, safety and troubleshooting: SPT301 user manual (PDF).

Good to Know

Caution
  • Plug voltage can reach tens of thousands of volts. Do not touch plugs during operation, and switch off before inserting, removing or repositioning them.
  • Stop using the tester if wiring is aged or damaged, and keep the safety cover intact.
Care
  • Confirm size and fit before testing unusual plug types.
  • Confirm suspected ignition faults on the vehicle; the bench result is a relative check.
  • Store in a dry, ventilated place away from heat, humidity and corrosive liquids.

You may also like

Select specifications

Offers

  • 10%
    10% off AUTOOL & MRCARTOOLBrands: AUTOOL, MRCARTOOL, FXTUL, CMTOOL, DUOYI · United States, United Kingdom and Australia only. Cannot be combined with other coupons.Code: AB10OFF

Offers are applied at checkout according to the store rules.

More

Delivery

Ships in 1-3 business days

Warehouses

  • US Warehouse
  • DE Warehouse
  • UK Warehouse
  • CN Warehouse

Choose the warehouse in the specifications.

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  • Credit / Debit CardVisaMastercardAmerican Express
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Available methods may vary by currency and billing country; the final list is shown at checkout.

Service

  • Secure checkout

    Payments are processed over an encrypted connection.

  • After-sales support

    Contact us for installation or usage questions.

Specifications

Brand
AUTOOL
Weight
500 g
Stations
3 sockets: 1 reference spark plug + 2 under test
Simulated Speed
200–9000 rpm adjustable
Display
Backlit LCD digital speed
Socket Height
Adjustable, supports long spark plugs
Power Supply
AC 110V / 220V ±10% input, DC12V output adapter
Ambient Temperature
0-45°C
Dimensions
200 × 118 × 118 mm
Weight
500 g
Compatibility
Common 12V car spark plugs and motorcycle spark plugs

Reviews11

4.9 / 5Based on 11 reviews
3 ★0
2 ★0
1 ★0
Ethan P.

I really appreciate that it can test long spark plugs, and the test probe height is adjustable. It features a backlit screen and a protective cover—the features aren’t flashy, but they’re all quite practical.

Emma W.

Having three test sockets is quite convenient—you can place the spark plugs side by side for comparison instead of having to swap them back and forth one by one. The RPM is also adjustable, making it easier to check the ignition.

Chuluun

AUTOOL SPT301 Car Spark Tester Automotive Diagnostic

AUTOOL SPT301 Car Spark Tester Automotive Diagnostic

Henry P.

I bought this product for my own car and it was very easy to perform the test…

I bought this product for my own car and it was very easy to perform the test myself. This is very useful and I really like this product.

Stipe L.

Spt301

Excelent

Michile

Good

Realistic simulation of engine speed! So that you can observe the difference in performance between a tested spark plug and a new one.

Sally R.

This AUTOOL SPT301 Spark Plug Tester is very practical!

This AUTOOL SPT301 Spark Plug Tester is very practical! It supports dual-station testing, which can test two spark plugs at the same time for higher efficiency.

Phoenix F.

good

Was able to identify a weak spark in one of my spark plugs when comparing it to the new ones. It shows a spark in various RPM load conditions.

L****i

good quality and excellent product I give it 5 stars

good quality and excellent product I give it 5 stars

Kerwin M.

GOOD

I really like AUTOOL products, SPT301 is very helpful, I always have problems with the power of my car, checking it with SPT301 revealed that it was a spark plug firing problem, fantastic, solved my big problem!

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AUTOOL SPT301 3-Socket Digital Spark Plug Tester – 200–9000 RPM
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AUTOOL SPT301 3-Socket Digital Spark Plug Tester, 200–9000 RPM
AUTOOL SPT301 3-Socket Digital Spark Plug Tester – 200–9000 RPM

US$59.00

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