Product description: Fippy automotive cylinder leak tester works with most car models with gasoline engines. It 's widely used to detect a variety of common engine faults such as worn piston rings, cylinder head cracks, worn valves and blown head gaskets. It checks the amount of leakage in an engine cylinder and helps determine the source. How to Use: 1. Start the engine and run to the normal working temperature. After the engine stops running, unload all spark plugs; 2. Make the throttle fully opened and press the connection of the pressure gauge on the spark cold hole; 3. Motors drive the engine to rotate at 100-150R/MIN speeds for 3-5 seconds. At this point, the pointer on the instrument will gradually rise, but will stop at a certain value. At this time, the indicator value is the compression pressure of the cylinder; 4. Press the button to zero the pointer; 5. According to the above steps, the measurement is repeated 2 to 3 times to improve the measurement accuracy. If the gauge doesn't read zero, please try below steps: 1. Remove rubber shock cover. 2. Twist and remove clear bezel. 3. Adjust to zero with calibration screw. 4. Showing gauge set to zero. Specifications: Test Unit/Mode: Bar, PSI Material: Metal, Rubber Color: Black Special function: Get accurate readings Pressure gauge diameter: 75mm Four thread size: M10 x 1.0mm, M12 x 1.25mm, M14 x 1.35mm, M18 x 1.5mm Hose overall length: 430mm Pressure tube length: 150mm Angled pressure tube length: 160mm Package Contents: 1 x Compression Tester 1 x Hose 4 x Thread 1 x Straight Line Pressure Pipe 1 x Angled Pressure Pipe 1 x Plastic Case