Features: 1.This is a non-contact handheld digital photo tachometer with stable performance. 2.Wide measuring range from 2.5RPM to 99.999 RPM and high resolution of 0.1RPM or 1RPM. 3.High sampling frequency, clear LCD display, high measuring accuracy. 4.This tachometer can automatically record the max value, min value and last value. 5.With auto range, low battery indication and other functions. 6.Wide used in the field of motor, wheels, lathe, electrical fan, paper making, plastic industry, washing machines, car making, etc. Specification: Model: DT-2234C+ Material: ABS Plastic Display: 5-digit 18mm(0.7") LCD Display Measuring Range: 2.5RPM - 99.999RPM Resolution: 0.1RPM at 2.5-99.99RPM, 1RPM at 1000-99999RPM Accuracy: ± (0.05%+1 digit) Measuring Distance: 50-500mm / 2-20in Time Base: 6MHz Quartz Crystal Oscillator Range Selection: Auto range Sampling Time: 0.8s(over 60RPM) Power Supply: 1 * 9V 6F22 Battery(NOT included) Power Consumption: Approx. 30mA Working Temperature: 0 ℃ ~ 50 ℃ (32 ℉ ~ 122 ℉ ) Item Size: 130*68*26mm / 5.1*2.7*1.0in Package Weight: Approx. 150g / 5.3oz Package list: 1 * Digital Tachometer 1 * Blue Bag 3 * Reflective Tape 1 * User Manual(English) .