Digital Flicker Speed Tester DM6238P 60-40,000 RPM Tachometer Flicker Tester
<1000 RPM: Coarse: ±10 RPM, Fine: ±0.1 RPM. ≥1000 RPM: Coarse: ±100 RPM, Fine: ±1 RPM. Resolution: <1000 RPM: 0.1 RPM. ≥1000 RPM: 1 RPM. Display: Backlit LCD, upper limit display 40000.