Tachometer DT-2236 is applicable to the product departments of motor, fan, paper-product, plastics, chemical fiber, washing-machine, automobile airplane, steamer etc.

Measuring range
Rotative velocity:
2.5~99,999r/min (Photo)
0.5~19,999r/min (Touch)
Surface speed: 0.05~1999.9m/min, 0.2~6560ft/min
Resolution: 0.01/0.1/1
Accuracy: +/-(0.05%n+1d)
Memory: max/min/last 
Power supply: 4x1.5V AA(UM-3)battery
Dimension: 220x68x38mm (8.7x2.7x1.5 inch)