Features and Benefits: Wireless Digital Tachometer * No sighting of rotating parts or hook up required * Works on DIS, Conventional, Magneto and most spark ignition system * For 1 to 2 cylinders and 2, 4 cycles and DIs engines * Measures from 200 to 20000 RPM on a 4-1/2 digits LCD display with simultaneous maximum and minimum readings * Advanced microcontroller technology yields 0.1% accuracy Digital Secondary Ignition Voltage Tester * Instant digital readings from 0 to 50000 Volt * Special antenna sensor allows quick hook-up to spark plug and ignition coil wire * No ground wire connections required, for fast troubleshooting * Adjustable Ignition peak voltage scale * Multiple diagnostic applications are described in comprehensive Users Handbook (Included) Includes hard padded case for carrying and storage, 9 volt alkaline battery and users manual.