Features: Practical Ignition Coil Tester:Our ignition coil tester is a battery-powered handheld quick tester designed to easily and quickly determine if the coil on plug is producing the proper spark for the plug. Accurate and Reliable Results:This ignition coil tester works by receiving a signal from the secondary ignition coil. Its test results are accurate and reliable. The tester will beep and the red LED will flash if the voltage is correct and the green LED will flash if the arc duration is correct. Practical Function:Our ignition coil tester can detect the signal of the ignition secondary coil. When receiving the signal it can detect whether the ignition voltage (combustion voltage or crest voltage) and the combustion time (flash duration) of the coil on plug are normal. Portable to Use:Our ignition coil tester is small in size and light in weight and the hand-held design makes it easy to carry on the go which is very convenient. Convenient to Use:This handheld ignition coil tester is convenient and fast to use. It is battery-powered stable and professional and easy to operate. Specification: Weight: about 180g Detection System: Automotive Ignition System Diagnosis Power supply voltage: 12 (V) Working temperature: -30~75() includes: 1* Ignition Coil Tester