Handheld tachometer is accurate to 1 rpm
HT-4100 tachometer is small, thin, and weighs less than 4 oz. Measurement is as simple as applying reflective tape or paint to the surface of a shaft. To operate, aim the red light beam at the reflective marker. An on-target indicator light flashes when the aim is correct. The light beam has a range of 12 in. Measurements can be made up to 50,000 rpm with an accuracy of 1 rpm.
Ono Sokki Technology, Inc.