Archer Digital Engine Tachometer.
Different settings to measure RPM on 2 stroke and 4 stroke engines.
Can be used wireless (pulse activation) or wired by using clip on lead provided.
Measures RPM from 100 to 19,000 with +/- 10 RPM accuracy level. 0.5 second refrest rate.
Similar to PET-1000R & Echo 99051130017.