From Hobbico:
Hobbico’s Mini Digital Tachometer provides accurate readings of dynamic and peak RPM. The results are displayed on an easy-to-view backlit LCD screen. Simply aim the tach at the prop to assist in optimizing your power system. Compact in size, the Mini Digital Tachometer takes up very little space in your field box.
Features:
- Works on 2-9 blade propellers
- Measures up to 99,999 rpm
- Display static and dynamic rpm on a backlit LCD screen
- Includes CR2032 Lithium-Ion battery