Test Range: 2.5 to 99,999 RPM (r/min) Resolution: 0.1 RPM (2.5 to 999.9 RPM); 1 RPM (over 1,000 RPM)

5 digits 18mm (0.6") LCDAccuracy: ±(0.05%+1 digit)Sampling Time: 0.5sec(over 120RPM)Range Select: Auto-RangingMemory: Max. value, Min. value, Last valueMeasuring Range: 2.5~99,999RPMResolution: 0.1RPM(2.5~999.9RPM)1RPM(over 1,000RPM)Detecting Distance: 50~500mmBattery: 3x1.5V AA batteryTime Base: 6MHz Quartz crystalTime Base Accuracy: 10x10-6(0~50°C)Power Consumption: Approx 40mADimension: 160Lx72Wx37H(mm)

DT2234A Photo tachometer(Laser)