Sanpo - Model SM2234A -Photo Tachometer(Laser)

Diisplay 5digit 18mmLCD. Range: 2.5~99999 RPM. Resolution: 0.1 RPM  From:(2.5~999.9RPM). 1 RPM From:((above 1000RPM). Accuracy: ± (0.05%+1digital) of  reading. Sampling Time: 0.8second (over 60RPM). Range Select: Auto-range. Time Base: 6MHz Quartz crystal. Memory: Max. value, Min. value, Last value. Can store 96s data. Detecting Distance: 50mm-500mm. Dimension: 155*70*35mm. Power: 3×1.5V AAA battery.