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. Specification: Model: DT2234C Display 5 digits 18mm(0.6")LCD Accuracy: ±(0.05%+1 digit) Sampling time: 0.5sec(over 120RPM) Range Select: Auto-switch Memory: max.value,min.value,last value Memory Range: 2.5-99,999RPM Resolution: 0.1RPM(2.5-999.9RPM), 1RPM(over 1,000RPM) Detecting Distance: 50-500mm Power: 3*1.5V(not included) Time Base: 10*10(-6)(0-50℃) Power Consumption: Approx. 40mA Dimension: Approx. 184*76*30mm / 7.2*3*1.2in Weight: Approx. 364g Package Includes: 1 x Tachometer (batteries not included) 1 x English user manual 3 x Reflective strip Package List 1 x Tachometer (batteries not included) 1 x English user manual 2 x Reflective strip