Features: Tachometerisoneofthenecessaryinstrumentsformachineryindustrywhichisusedtodetectrotatespeedlinearvelocityorfrequencyofmotor.Itcanpreciselymeasurerotatespeedofimpellerbladeexpansion cylinderandspindleandcanbewidelyusedinmotorfanwashingmachinetextileautomobileairplaneshipandotherindustries. Specifications: *MeasuringRange:2.5~99999rpm *Resolution:0.1rpm(2.5~999.9rpm) 1rpm(1000~99999rpm) *Accuracy:(0.1%n+5d)rpm;(2.5~999.9rpm) (1%n+5d)rpm;(1000~99999rpm) *LaserPower:CLASS2II2-5mW *SamplingRate:1time/second *MeasuringDistance:50-500mm *TimeBase:QuartzCrystal *MAX.MIN.AVG.andLASTValue *OperatingEnvironment:0~50C;32~122F;10%~90%RH *StorageEnvironment:-10~80C;-14~176F;10%~75%RH *AutoPowerOff:OneMinuteWithoutAnyOperation*Power:2*1.5VAAABatteries(NOTIncluded) *Weight:97g *Dimension:127*55.7*27mm Packageincluded: 1xRotationSpeedDigitalTachometer