Function: The cylinder compression tester kit is used to quickly and accurately test the cylinder pressure of gasoline engines. Meter readings can help diagnose the following problems: stuck valve, carbon deposits, cracked cylinder head or defective main gasket, poor or worn piston ring installation, burned or damaged piston.Application: Gasoline engine cylinder --- equipped with different sizes of rotating and push-in adapters, widely used in most types of gasoline gasoline gas engine cylinders and deep spark plugs, common in motorcycles, lawn mowers, cars, trucks, ATV and many more. Not suitable for crude oil engines.Stable quality tester: Maximum 300PSI or 20BAR dual pressure device, with easy-to-read dial, acrylic glass meter cover with scratch-resistant coating and rubber protective cover with excellent shock absorption performance. The built-in one-way valve with pressure holding function ensures that the pressure gauge obtains the maximum pressure at the spark plug during the compression process.Color: black+silverMaterial: metal1. : It is an instrument specially used to check the compression pressure of gas in the cylinder.2. How to use:(1) Start the engine and run it to normal operating temperature, turn off the engine and wait until the engine stops running, then remove all spark plugs;(2) Fully open the throttle valve, and press the connector of the pressure gauge on the spark plug hole;(3) Use the motor to drive the engine to rotate at a speed of 100-150r/min for 3-5 seconds. At this time, the pointer on the instrument will gradually rise, and it will stop when it reaches a certain value, and the indicated value at this time is the compression pressure of the cylinder;(4) Press the button to reset the pointer to zero;(5) Repeat the measurement 2 to 3 times according to theabove steps to improve the measurement accuracy.Notice:Case Color Send Randomly Do not accept designationPackage Contents:1 x Automobile compression test toolOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.