Photo/Contact Tachometer Surface Speed Meter 6235B
 

5 digits 18mm (0.6") Yellow backlight LCD
Accuracy: ±(0.05%+1 digit)
Sampling Time: 0.5 sec(over 120RPM)
Range Select: Auto-Ranging
Memory: Max. value, Min. value,
Last value. Can store 96s data.
Time Base: 6MHz Quartz crystal
Detecting Distance: 50~500mm
Measuring Range:
Photo Tach: 2.5~99,999RPM
Contact Tach: 0.5~19,999RPM
Surface Speed: 0.05~1,999.9m/min
Resolution:
Photo Tach: 0.1RPM(2.5~999.9RPM)
1RPM(over 1,000RPM)
Contact Tach: 0.1RPM(0.5~999.9RPM)
1RPM(over 1,000RPM)
Surface Speed: 0.01m/min(0.05~99.99m/min)
0.1m/min(over 100m/min)
Battery: 4x1.5V AA battery