Digital Laser and Contact Tachometer (DT-6236B)

Display: 5 digits, 31mm blue backing LCD display
Test Range: 
PHOTO TACH: 2.5 to 99, 999RPM
CONTACT TACH: 0.5 to 19, 999RPM
SURFACE SPEED: 0.05 to 1999.9m/min
Resolution: 
PHOTO TACH: 0.1RPM (2.5 to 999.9 RPM)
1RPM (over 1000 RPM)
CONTACT TCAH: 0.1RPM (0.5 to 999.9 RPM)
1RPM (over 1000 RPM)
SURFACE SPEED: 0.01m/min (0.05 to 99.99m/min)
0.1m/min (over 100m/min)
Accuracy: ±(0.05%+1 digit)
Sampling Time: 0.8 sec. (over 60 RPM)
Test Range Select: Automatic
Memory: Max. Value, Min. Value, Last Value. 
Battery: 4×1.5V UM-3 battery or to connect the DC 6V Regulated power supply
Power Consumption: Approx. 50mA
Operation Temp.: 0 to 50 C(32 to 122 F)