Measuring range: rotative velocity laser: 2.5-99999r/min; Contact 0.5-1999r/min Accuracy: +/-(0.05%n+1d) Application: applicable to the product departments of motor, fan, paper-product, chemical fiber, washing-machine, automobile, airplane, steamer etc.Measuring range: rotative velocity laser: 2.5-99999r/min; Contact 0.5-1999r/minSurface: 0.05-1999.9 m/min; 0.2-6560ft/minLaser tacho detecting ...