Photo Tachometer 6234E
Display: 5digital, 18mm LCD
Range: 2.5~99999 RPM
0.05~1666 Hz
1~99999 Count
Resolution: 0.1 RPM   From:(2.5~999.9RPM)
1 RPM  From:((above 1000RPM)
0.01Hz   From:((0.05~99.99Hz)
0.1Hz   From:((above 100Hz)
Accuracy: ± (0.05%+1digital) of  reading
Sampling Time: 0.8second (over 60RPM)
Memory: Max. value, Min. value, Last value. Can store 96s data.
Range Select: Auto-range
Time Base: 6MHz Quartz crystal
Detecting Distance: 50mm-500mm
Dimension: 155*70*35mm
Power: 3×1.5V AAA battery
 
 
 
Photo/Contact Tachnometer with Surface Speed 6236E
 
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. 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