Digital Laser Photo Tachometer RPM Meter Non-Contact Motor Speed Gauge DT2234C

PHOTO TACHOMETER (Laser)   DT2234C

5 digits 18mm (0.6") LCD
Accuracy: ±(0.05%+1 digit) of  reading
Sampling Time: 0.5sec(over 120RPM)
Range Select: Auto-Ranging
Memory: Max. value, Min. value, Last value
Measuring Range: 2.5~99,999RPM
Resolution: 0.1RPM From: (2.5~999.9RPM)
            1RPM From:(over 1,000RPM)
Detecting Distance: 50~500mm
Battery: 3x1.5V AAA battery (Not included)
Time Base: 6MHz Quartz crystal
Time Base Accuracy: 10x10-6(0~50°C)
Power Consumption: Approx 40mA
Dimension: 184Lx76Wx30H(mm)