Dual Hole Adjustable Car Spark Plug Tester

Features
Car Spark Plug Tester Detector with Dual Hole Advantage:
Dual Hole Car Spark Plug Tester Detector have two testing holes, you can test two spark plugs and if you suspect any spark plug works improperly you could compare and test to make an accurate judgment.
Usage: Test spark plug performance and ignition strength.
Application Range: 12V Petrol vehicles car spark plugs.

Principle:
In an automobile ignition system, the high-voltage ignition coil generates a high voltage (10000 volts or more), and the spark plug diverts its form.
High-tension ignition coil in the cylinder engine, the spark between the spark plug electrodes will ignite the mixture. The Detector could tell the good spark plugs from the bad by the strength of the spark.

Using Note:
Please Turn Off the Power before you place the spark plug.
The Spark Plug Tester is a high-voltage detector, so do not touch the spark plug with your hand at work to avoid danger.

User Manual:
Place the Spark Plug into tester hole 1 or 2; If you want to compare the new spark plug and the old one, place the new spark plug into hole 1 and the old one into hole 2
Connect to the power supply
Turn the key switch 4 clockwise to turn on the tester, indicator 3 will light up, tester is now working at 1000rpm/min.
Again turn the key switch 4 clockwise, you can adjust the working frequency between 1000rpm to 5000rpm/min. The higher the frequency, the stronger the spark strength.

Parameters:
Main Unit Weight: 220g( Not including Power Adapter).
Power Adapter: Input 100-240V AC / Output 12V 1A DC.

What's in the box
1 x Spark plug tester
1 x Power Adapter
1 x User manual