AUTOOL SPT105 6000 RPM Dual-Socket Spark Plug Tester with Adjustable Height

Fire Two Spark Plugs Side by Side, Including Long-Reach Plugs

The SPT105 fires two removed spark plugs in open air at the same bench setting so you can compare spark strength and continuity through a transparent cover. Height-adjustable sockets fit plugs with longer terminal ends. It tests spark plugs only; it is not a full ignition-system diagnostic tool.

2 Test Sockets
Adjustable Socket Height
Up to 6000 rpm
Transparent Safety Cover
110 V / 220 V Versions

Key Features

Side-by-Side Comparison

Two sockets fire at once, so a suspect plug can be checked directly against a known one under identical conditions.
Adjustable Test-Hole Height

Raise or lower the sockets to fit longer spark plug ends used on BMW, Volkswagen, Audi and other models.
Rotary Speed Control

A control knob sets the simulated engine speed so you can watch plug behavior at different firing rates.
Visual Spark Check

Judge ignition strength, spark continuity and relative performance through the clear cover.
Protective Cover

Closing the cover before testing reduces direct exposure to sparks.

Model Comparison

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

What’s in the Box

SPT105 spark plug tester
Power adapter
User manual
Retail box

AUTOOL SPT105 spark plug tester with power adapter, user manual and retail box — SPT105 package as shown by the manufacturer; the plug type depends on the voltage version.

How to Use

Place the spark plugSeat the plug securely in the test hole, adjusting the height for longer plug ends.
Close the coverClose the transparent protective cover before starting the test.
Power on and set speedConnect the correct 110 V or 220 V supply, then set the simulated speed with the control knob.
Observe and compareWatch the sparks through the cover and compare both plugs at the same setting.

Height adjustment, speed simulation and safety: SPT105 user manual (PDF).

Good to Know

Caution

Always close the protective cover before testing and keep hands away from the test holes while the tester is working.
Choose the 110 V or 220 V version that matches your local supply before ordering or connecting power.

Care

Confirm the plug thread, seat, reach, terminal shape and cover clearance before testing a long plug.
Confirm any suspected ignition fault with the vehicle procedure; an air-bench result does not reflect real engine load.