Specification:Model: DT2234CDisplay 5 digits 18mm(0.6")LCDAccuracy: (0.05%+1 digit)Sampling time: 0.5sec(over 120RPM)Range Select: Auto-switchMemory: max.value,min.value,last valueMemory Range: 2.5-99,999RPMResolution: 0.1RPM(2.5-999.9RPM), 1RPM(over 1,000RPM)Detecting Distance: 50-500mmPower: 3*1.5V(not included)Time Base: 10*10(-6)(0-50)Power Consumption: Approx. 40mADimension: Approx. 184*76*30mm / 7.2*3*1.2inWeight: Approx. 364g Features: Wide measuring range and high resolution. Measures exact RPM with no guessing or errors. Memorized the last value, max. value and min. value. Low battery power indication. Non contact type handheld meter, convenient to use.