Hand held photo reflective tachometer uses LASER beam. 5 digit LCD display measures RPM from 2.5-99,999. Resolution: .1RPM /2.5-999, 1RPM/above 1000. Features Hi/Lo/ Last reading memory. Powered by 4 “AA” cells or included 120VAC adapter. Requires reflective area on a non reflective surface. L: 6-1/2" W: 3" T: 1-1/2" Shp. WT: 1.52
