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
Hauptmerkmale
-
Reference Comparison
Fire a new or known-good plug next to two test plugs for a direct visual comparison of spark strength.
-
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.
-
Adjustable Socket Height
Socket height adjusts to accept longer spark plug ends.
-
Transparent Safety Cover
Watch spark behavior through the cover while reducing direct spark exposure.
-
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
- Bedienungsanleitung
- Retail box
Anwendung
- Place the plugsWith power off, fit the reference plug in the standard hole and the plugs to be tested in the test holes.
- Close the coverLower the protective cover before testing.
- Power onPlug the adapter into the side power socket, connect power and switch on.
- 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.
English 
German 
Spanish 