Review on JIFETOR Cylinder Leak Down Tester Kit with Dual Pressure Gauges - Professional Engine Compression Leakdown Detector Leak Test Set for Gasoline Engines, Suitable for Car Truck Motorcycle with 10 12 14mm Spark Plugs by Jason Bell

This is a defective product which has cost me almost thousands of dollars on my '09 BMW 750 li. You must stop selling this product until you repair the main hose that connects the spark plug sensors to the cylinder. That's what happened. I screwed a hose into the spark plug cylinder and connected the other end to pressure gauges to force air into the cylinder. After I disconnected the air from the cylinder and tried to unscrew the air duct from the spark plug cylinder, but it continued to rotate and rotate, but unscrewed. I used a mirror and could see the hose turning in the spark plug hole, but the part of the hose that threaded into the block didn't turn. What a mess. I had to burn the hose and stick a screwdriver in the middle I wanted and remove the fitting from the spark plug hole. If it didn't work, it would have cost me thousands of dollars to fix this problem. The hose should never be twisted at the fitting near the end that goes into the spark plug hole as you will not be able to pull the hose out once you have screwed it into the spark plug hole.