Car tester spark plugs with two candles, tester spark plugs, tester spark plugs 12 V do display test Characteristic: Easy to use, plug and play, economical and useful tool. Two test holes, you can test two spark plugs in the meantime. More intuitive display of spark plug status. Tester is used do test the properties of spark plugs and ignition force. Scope of application: 12V petrol vehicles, automotive spark plugs Suitable for spark plugs 12MM Compatible with 10MM spark plugs Specification: Item Type: Tester Spark Plugs Material: ABS metal Color: Black Power Supply: Input 100-240V AC / Output 12V 1A DC Size: about 145 * 85 * 60 mm (due to manual measurements, deviation from 1 do 2 mm may occur). Application: 12V petrol spark plug What is the role of the spark plug? The task of the spark plug is to introduce tens of thousands of volts of high voltage current do of the combustion chamber and produce electric sparks to ignite the mixture. The spark plug works with the ignition system and fuel supply system to ensure the normal functioning of the engine, which largely determines its performance. Spark plugs are an everyday consumable in cars. As the core of a car engine, they can one almost directly decide the performance of the car. Therefore, you should always check the spark plug in the car. Product function: adjustable frequency, can detect different working conditions in tempering situation improved design of do fire jumping test station, do fire jumping hole away from adjustable knob, safer to use. with 3 indicator lights, can detect whether the signal is exceeded, no fire adjustment is a problem of instrument or spark plug, more accurate evaluation. you can assess the good and bad condition of the spark plug, jumping fire in a straight line is good, intermittent is a problem. can be assessed the degree of ageing of the spark plug, the jumping light purple spark means good, dark red serious ageing you can evaluate different brands of spark plugs with different specifications, in the same signal, the jumping fire strongly collecting sound is good and vice versa for the next standard with power supply, jumping fire more stable, more durable to use with European standard adapter plugs Turn off the power before placing the spark plug Tester spark plugs is a high voltage detector, so do not touch the spark plug with your hand during operation to avoid danger. Turn off the power before placing the spark plug Tester spark plugs is a high voltage detector, so do not touch the spark plug with your hand during operation to avoid danger. Instructions for operating a car spark plug tester: place the spark plug in the hole 1 or 2 of the tester; if you want to compare the new spark plug with the old one, place the new spark plug in the hole 1 and the old one in the hole 2. connect do power supply Turn the key switch clockwise to turn on the tester, the indicator will light up, the tester is now operating at 1000 rpm. Turn the switch clockwise again to adjust the operating frequency from 1000 rpm do 5000 rpm. Im higher the frequency, the greater the power of the spark.