Electronic Specialties 328, EZ TACH PLUS

Features: 
Versatile instrument can measure RPM on a wide variety of engines from string trimmers to automotive. 
Reads engine revolutions from 0 to 20,000 RPM 
Picks up RPM signal wireless or with supplied inductive pickup 
Great for setting idle speeds! 
Built-in LED Flashlight which can be used while taking measurements 
Backlit LCD display 
Accuracy +10 RPM