Range: Photo rotation speed : 2.5~99,999r/minContact rotation speed: 0.5~19,999 r/minContact line speed (Metric): 0.05~1999.9 m/minAccuracy: ±(0.05%+1)Resolution: Photoelectric rotation speed: 0.1RPM (2.5~999.9 RPM); 1RPM (>1000RPM)Contact rotation speed: 0.1 RPM (0.5~999.9 RPM); 1 r/min (>1000 RPM)Contact line speed (Metric): 0.01 m/min (0.05~99.99 m/min); 0.1 m/min (>100 m/min)Sampling time: 0.5s (>120 r/min)Range selection: Auto rangeEffective distance: 50~250mmPower consumption: Max.40mAMemory: Auto memory Max./Min. and last valueTime base: 6MHz Quarts crystalTime base accuracy: 10x10-6 (0℃~50℃)Battery: 4x1.5V AAMeter Size: 160x72x37mmMax. Display: 99999LCD size: 5 digits LCD displayBacklight: Yellow green backlightAccessories: Battery, Carrying case, Reflecting tape marks, Damp proof accessory, Bolt bag, Contact speed measurement fitting, Contact rotational speed measurement fitting, User manualCarrying case ................. 1 PCReflecting tape marks (600 mm)Operation manual ...1 PC