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. li> Two test holes, you can test two spark plugs in the meantime. li> More intuitive display of spark plug status. li> < li > Tester is used do test the properties of spark plugs and ignition strength. li> Scope of application: 12V petrol vehicles, automotive spark plugsli> Suitable for 12MM spark plugsli> Compatible with 10MMli> spark plugs - Inner mesh panties Item type: Tester spark plugsli> Material:ABS metalli> Color:blackli> Power supply: Input 100-240V AC /Output 12V 1A DCli> Size:approximately 145 * 85 * 60 mm (due to manual measurements, deviation from 1 do 2 mm may occur). li> Application: 12 V petrol spark plugli> What is the role of spark plug? The purpose 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 Feature: adjustable frequency, can detect different working conditions in tempering situationli> improved design of test bench do fire jumps, hole do fire jumps away from the adjustable knob, safer to use. li> with 3 indicator lights, can detect whether the signal is exceeded, no fire adjustment is a problem of the instrument or spark plug, more accurate evaluation. li> can be assessed good and bad condition of the spark plug, jumping fire in a straight line is good, intermittent is a problem. li> can be assessed the degree of ageing of the spark plug,A jumping bright purple spark means a good, dark red serious ageingli> can be assessed different brands of spark plugs with different specifications,in the same signal, a jumping fire strongly collecting sound is good and vice versa for the nextli> standard with power supply,Jumping fire more stable, more durable to useli> with European standard adapter plugsli> Turn off the power before placing the spark plugli> Tester spark plugs is a high voltage detector, so do not touch the spark plug with your hand during operation to avoid danger. li> Turn off the power before placing the spark plugli> Tester spark plugs is a high voltage detector, so do not touch the spark plug with your hand during operation to avoid danger. li> User manual for car spark plug tester: place the spark plug in the tester hole 1 or 2; 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. li> connect do powerli> turn the key switch clockwise,to enable tester,the indicator will light up, the tester is now operating at 1000 rpm.li> Turn the switch clockwise again,to adjust the operating frequency from 1000 rpm do 5000 rpm.li> Im higher the frequency, the greater the power of the spark.