Application: applicable to the product departments of motor, fan, paper-product, chemical fiber, washing-machine, automobile, airplane, steamer etc. Model: DT2858 Measuring range: rotative velocity laser 2.5-99999r/min Contact 0.5-1999r/min Surface: 0.05-1999.9 m/min 0.2-6560ft/min Laser tach detecting distance: 50-600mm Accuracy: ±(0.05%n+1d) Resolution: 0.01/0.1/1 Memory: max/min/last value Power supply: 4x1.5V AA (UM-3) battery Battery indicator: low battery indicator Dimensions: 220x75x29mm Weight (not including probe):174g