This very affordable, hand-held tester provides many of the diagnostic capabilities of large, expensive units. It features a display providing live, minimum and maximum readings for the following measurements:
1)Spark plug firing voltage
2)Spark plug burn time
3)Spark plug burn voltage

This information permits accurate, professional diagnosis of the spark plugs, plug wires, ignition system, fuel control and most other factors affecting the spark plug voltage and combustion chamber. You get information normally available from "big box" analyzers, with an affordable device that fits in the palm of your hand! We think that it's a true diagnostic breakthrough. Fully tested on both conventional and distributorless ignition systems, and direct spark systems using an additional spark plug wire. A simple rotary switch selects firing voltage, burn time, and burn voltage. All readings are taken on each firing of the spark plug. The tester may be used on any gas engine, including those on motor vehicles, lawn mowers, snow blowers, motorcycles, personal watercraft, snowmobiles, marine and industrial equipment, etc. Tester has an internal battery. On-screen indicator advises when battery replacement is needed. An operator's manual is included.