Accurate SpecificationsAccuracy: (a% reading + b digits), guarantee for 1 year.Operating temperature: 23oC 5oCOperating humidity: 80%RHTemperature Coefficient: 0.1 x (accuracy) /oCRange Resolution Accuracy10~99.999 r/min100~999.99 r/min1000~9999.9 r/min10000~99999 r/min0.001 r/min0.01 r/min0.1 r/min1 r/min( 0 . 0 4 % + 2 )A. RPMB. CountsRange Resolution Maximum input frequency0~ 99999 1 digits 10kHz, Pulse Width 5%Model UT371/372: OPERATING MANUAL20