Optical speedometer DT2234C

Optical speedometer Model: DT2234C Instrument: Size: 5 large LCD display, character height 18mm measuring range: 2.5-99999 rev / min (RPM) Resolution: 0.1RPM (2.5 ~ 999.9RPM) 1RPM (1000RPM above) accurately Degree: ± (0.05% + 1 word) Sampling time: 0.5 seconds (120RPM above) range selection: automatic switching Effective distance: 50mm-500mm Operating Current: 40mA max Memory: automatic memory maximum, minimum, last measured value base: 6MHz quartz crystal timebase accuracy: 10X10-6 (0 ℃ ~ 50 ℃) Power: No 3X1.5V7 battery Dimensions: 184X76X30mm