1.remember self: Max. value, Min. value, Last value 2.auto-Ranging 3.rang selece:auto-switch 4.measuring rang:2.5-99999RPM

Main information:

     5 digits 18mm (0.6") LCD      Accuracy: ±(0.05%+1 digit)      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(2.5~999.9RPM)     1RPM(over 1,000RPM)      Detecting Distance: 50~500mm      Battery: 3x1.5V AA battery(DT2234

     Time Base: 6MHz Quartz crystal     Time Base Accuracy: 10x10-6(0~50°C)     Power Consumption: Approx 40mA     Dimension: 160Lx72Wx37H(mm)(DT2234A)    

photo tachometer(laser)