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By certification 
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
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
