display: 5 digits 18mm(0.6")yellow green backlight lcd
accuracy: ±(0.05%+1 digit)
sampling time: 0.5 sec(over 120rpm)
range se-lect: auto - ranging
memory: last value,max. value,min.value
can store 96s data
power consumption: approx 55ma
time base: 6mhz quartz crystal
detecting distance: 50mm to 500mm
measuring range:
photo tach 2.5 to 99999rpm
contact tach 0.5 to 19,999rpm
surface speed(m/min) 0.05 to 1,999.9(m/min)
resolution:
photo tach: 0.1rpm(2.5 to 999.9rpm)
　　　　　　　1rpm(over 1000rpm)
contact tach: 0.1rpm(0.5 to 999.9rpm)
　　　　　　　　1rpm(over 1000rpm)
surface speed(m/min) 0.01m/min(0.05 to 99.99m/min)
　　　　　　　　　  0.1m/min(over 100m/min)
power: 4x1.5v aa size battery or to external dc 6v regulated power supply