The diagnostic tester is an evap machine used in leak diagnostic process, it can be gas or air leaks. This machine uses artificial smoke to the vacuum systems in the engine and can determine if fuel pipe lines, cooling tank, turbo system, intake systems or exhaust system have leaks. This portable device has a built-in pressure gauge, air compressor and dual flow meters for a precise smoke test. If your engine has reduced its power, has poor acceleration, hearing wheezing sound under the hood or the Check Engine Light is showing then the vacuum systems on your vehicle may have a problem or needs a smoke diagnostic test. Compatible with 12V Vehicles. Universal Specification Power Supply: 12V Vehicle Battery, 8Amp Output Pressure: 1.2bar Flow Rate: 7L/Min Length of Smoke Hose: 2.5 Meters Length of Power Cord: 2.5 Meters Working Cycle: 5 Min auto-stop