AUTOOL SPT301 Car Spark Tester Automotive Diagnostic

AUTOOL SPT301

Product Overview

The AUTOOL SPT301 car spark tester is designed to test spark plug performance and spark strength under simulated engine working conditions. It supports three-hole comparative testing, 200-9000 RPM adjustment, a digital RPM display, and a transparent safety cover for safer visual inspection of common crankshaft-engine and motorcycle spark plugs.

Three-Hole Testing 200-9000 RPM Digital Display Safety Cover

AC 110V / 220VInput Power

3Test Holes

9000 RPMMax Simulation

3 YearsMain Unit Warranty

AUTOOL SPT301 spark plug tester main product image with three-hole design 9000 RPM digital display and safety cover

Before You Order And Use

SPT301 is a high-frequency spark plug tester. Read the power, protective cover, high-voltage, and maintenance notes before inserting spark plugs or starting a test.

Power Off Before Installing Plugs

Do not insert or remove spark plugs while the power supply is connected. Turn off the tester before installing, removing, or repositioning spark plugs.

Close The Safety Cover

Close the transparent protective cover before testing. It helps reduce direct exposure to sparks during visual observation.

Do Not Touch During Operation

When the spark plug is running, the voltage can reach tens of thousands of volts. Do not touch the spark plug directly with bare hands.

Use Correct Input Power

Use AC 110V / 220V ±10% input power as specified for the SPT301 spark plug tester.

Use For Suitable Spark Plugs

SPT301 is suitable for common 12V automotive spark plug testing and motorcycle spark plug checks. Confirm size and fitment before testing unusual plug types.

Store In A Dry Place

When not in use, store the tester in a dry, ventilated place. Avoid hot, humid, non-ventilated areas and contact with corrosive liquids.

Maintenance Reminder

Regularly check parts that need to be tightened or connected. Tighten loose parts before operation.
Avoid rubbing the housing against rough surfaces to reduce wear.
Do not overload the equipment, and make sure the safety guard remains complete and reliable.
If wiring shows aging or damage, stop use and contact support before continuing.

Key Features

SPT301 combines three-hole comparison, adjustable simulated RPM, digital display control, long spark plug support, and a safety cover to make spark plug condition checks faster and easier to observe.

Comparative Testing

Test one standard or new spark plug together with two test spark plugs for a more straightforward visual comparison of spark strength and performance.

200-9000 RPM Simulation

Simulate spark plug operating status during engine function with adjustable RPM. A higher simulated frequency shows stronger spark intensity during testing.

Three-Hole Design

The three-hole layout supports simultaneous comparison of three spark plug positions, making it suitable for efficient 12V automotive spark plug checks.

Adjustable Test Hole Height

The adjustable test hole height helps support longer spark plug ends and improves compatibility for models that use longer plug structures.

Digital RPM Display

The LCD digital backlit display clearly shows the simulated RPM, helping users control test conditions with better visibility.

Transparent Safety Cover

The protective cover lets users observe spark behavior while reducing direct spark exposure during operation.

AUTOOL SPT301 simulated RPM testing range 200 to 9000 RPM

AUTOOL SPT301 comparative testing with one normal plug hole and two test plug holes

AUTOOL SPT301 transparent safety cover for safer spark plug testing

AUTOOL SPT301 digital screen display for simulated engine RPM

AUTOOL SPT301 three-hole design with 12mm spark plug test holes

AUTOOL SPT301 adjustable test hole height for longer spark plug ends

AUTOOL SPT301 product structure with standard test hole test holes display screen RPM buttons power switch and power port

Specifications

AUTOOL SPT301 Product Specifications

SPT301 uses AC 110V / 220V input power, DC12V output, 200-9000 RPM simulated speed, and a compact 200 × 118 × 118mm body with a 500g product weight.

Core Specifications
Product	AUTOOL SPT301 Car Spark Plug Tester
Working Principle	Digital sensing
Input Power	AC 110V / 220V ±10%
Output Power	DC12V ±2 1A
Simulated RPM	200-9000 RPM
Ambient Temperature	0°C-45°C
Relative Humidity	<85%
Product Dimensions	200 × 118 × 118mm
Product Weight	500g
Testing And Display
Test Hole Positions	3
Adjustable Hole Position Height	Supported
Working Condition Simulation	Supported
Adjustable Simulated RPM	Supported
LCD Digital Backlit Screen	Supported
Long Spark Plug Testing	Supported
Safety Protection Cover	Supported
Product Structure
Standard Test Hole	Reference plug position for comparison
Test Holes	Two test plug positions
Controls	RPM “+”, RPM “-”, and power switch
Interface	Display screen and power port

AUTOOL SPT301 product specifications showing power RPM temperature humidity dimensions and weight

Core Specifications

Input PowerAC 110V / 220V ±10%

Output PowerDC12V ±2 1A

Simulated RPM200-9000 RPM

Ambient Temperature0°C-45°C

Relative Humidity<85%

Dimensions200 × 118 × 118mm

Weight500g

Testing Features

Test Holes3

Adjustable Hole HeightSupported

LCD Backlit ScreenSupported

Long Spark Plug SupportSupported

Safety CoverSupported

How To Use

Install the spark plugs, close the protective cover, connect power, adjust the simulated RPM, and observe the spark plug test status through the transparent cover.

Place The Spark Plugs

Insert the standard spark plug into the standard test hole, then insert the spark plugs to be tested into the test holes.

Close The Protective Cover

Cover the protective cover before testing to reduce direct spark exposure and improve safety during observation.

Connect Power And Start

Plug the power adapter into the side power interface, connect the power supply, and turn on the power switch.

Adjust RPM And Observe

Use the “+” and “-” buttons to adjust the working frequency, then observe the spark plug test status through the protective cover.

Use Notes

Turn off the power before inserting, removing, or adjusting spark plugs.
Do not touch the spark plug directly during operation.
The higher the working frequency, the stronger the displayed spark plug intensity during testing.
If the spark plug is unusually long or has an uncommon structure, confirm the fit before testing.

Product Comparison

Compare SPT301 with SPT101, SPT105, and SPT360 before choosing the right hole count, RPM range, digital display, long spark plug support, and comparison capacity.

SPT101Entry dual-hole model with 0-6000 RPM, safety cover, adjustable simulated RPM, and no LCD digital backlit screen or long spark plug support.

SPT105Dual-hole model with 0-6000 RPM, adjustable hole position height, safety cover, adjustable simulated RPM, and long spark plug support.

SPT301Three-hole model with 200-9000 RPM, adjustable hole position height, safety cover, LCD digital backlit screen, and long spark plug support.

SPT360Five-hole model with 200-9000 RPM, LCD digital backlit screen, and higher comparison capacity for users who need more test positions.

Decision CheckChoose by test hole count, RPM range, adjustable height, digital display, long spark plug compatibility, and workshop testing volume.

AUTOOL SPT101 SPT105 SPT301 and SPT360 spark plug tester comparison chart

Spark Plug Tester-Everything You Need to Know

Understand what a spark plug tester does, how spark strength comparison works, and when this type of diagnostic tool is worth buying.

February 26, 2025

Why Are Spark Plugs Replaced in Sets of Four?

Learn why grouped replacement matters and how consistent plug performance affects comparison testing and ignition troubleshooting.

July 9, 2021

When the car has any symptoms, it means that the spark plug should be replaced?

Use common misfire and performance symptoms as a quick reference when deciding whether to verify plugs with a spark tester.

October 23, 2024

Car Maintenance Guide: Everything You Need To Know

Review routine maintenance context around ignition health, replacement timing, and workshop inspection habits before spark plug diagnosis.

Manual And Downloads

Download the SPT301 manual for safety cautions, product structure, specifications, operating instructions, maintenance guidance, warranty access, and return or exchange information.

AUTOOL SPT301 spark plug tester user manual preview

AUTOOL SPT301 Manual PDF

Open the manual for SPT301 setup, warnings, operation, maintenance, and warranty details.

Download Manual

Need Setup Confirmation?

Contact AUTOOL Store if you need to confirm input power, spark plug fitment, SPT101 / SPT105 / SPT301 / SPT360 model selection, safety cover use, or package contents before ordering.

Emailsupport@autoolstore.com WhatsApp+86 189 2647 7404

AUTOOL SPT301 packing list showing spark plug tester retail box user manual and power adapter

What Is In The Box

The package image shows the SPT301 main unit, retail box, user manual, and power adapter. Spark plugs shown in function images are for testing demonstration and are not listed as included accessories.

Main UnitAUTOOL SPT301 spark plug tester

Power AdapterIncluded power adapter shown in the package image

DocumentationAUTOOL SPT301 user manual

Retail BoxAUTOOL SPT301 packaging box

AccessoriesRefer to the official package image for final included accessories

Questions And Answers

These answers cover spark plug compatibility, three-hole comparison, RPM adjustment, power input, safety cover use, model selection, package contents, and warranty support.

What Spark Plugs Can SPT301 Test?

How Many Spark Plugs Can It Test At The Same Time?

Can The Simulated RPM Be Adjusted?

What Power Supply Does SPT301 Use?

Do I Need To Close The Protective Cover Before Testing?

What Is The Difference Between SPT301 And SPT360?

What Is Included In The Package?

How Long Is The Warranty?

Warranty And Contact

For SPT301 setup, power input confirmation, spark plug compatibility, safety cover use, package contents, manual support, warranty service, or SPT101 / SPT105 / SPT301 / SPT360 model selection, contact AUTOOL Store directly.

Pre-Sales And Product Support

Use support if you need help confirming whether SPT301 is the right three-hole spark plug tester for your vehicle, workshop workflow, input power environment, or comparison testing needs.

SPT301 setup and safe-use confirmation
AC 110V / 220V power input questions
Common spark plug and long spark plug fitment support
SPT101 / SPT105 / SPT301 / SPT360 model selection
Packing list and accessory confirmation
Main unit warranty and accessory warranty support

Email Supportsupport@autoolstore.com WhatsApp Support+86 189 2647 7404

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