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RPM Range: 700-4500RPM
10 level aperture adjustment
5 preset RPM value
Rotary dial for RPM value adjustment
Power supply: CR2032 button battery
It is a must have tool for any pilot. The optical tachometer can measture the RPM of any rotating object, perfect for helicopter rotors, airplane propellers and multi-copters. The SkyRC optical tachometer is small, light weight, fast and accurate.