Large measuring range (from 2.5 to 99999 RPM) and high resolution (from 0.1 to 1 or 1 RPM). Automatically records MAX value, MIN value, and last value with low battery indication. Can measure at a distance of 2-20 inches (50-500 mm) with a large LCD display. 0.8 second sampling rate and 5-digit 18mm LCD display with non-contact RPM measurement. Non-contact digital photo tachometer with stable performance. Wide range of applications: can typically be used in the fields of motors, wheels, lathes for metal or woodworking, fan electricians, paper manufacturing, plastics industry, chemical fibers, washing machines, etc. DT-2234C+ Non-Contact LCD Digital Tachometer 2.5-99,999 RPM Meter Tester p> Display: 5 digits and 18mm (0.7 inch) LCD display Measuring Range: 2.5 RPM-99,999 RPM Resolution: 0.1 RPM at 2.5-999.9 RPM, 1 RPM at 1000-99,999 RPM Accuracy: ± (0.05% + 1 digit) Measuring Distance: 50-500 mm / 2-20 inches Time Base: 6 MHz quartz crystal oscillator Sampling Time: 0.8 s (more than 60 RPM) Power Supply: 1 * 9 V 6F22 battery (not included) Power Consumption: approx. 30 mA Operating Temperature: 0 ℃ ~ 50 ℃ (32 ℉ ~ 122 ℉) Size: 130 * 68 * 26 mm / 5.1 * 2.7 * 1.0 inches It is a portable digital non-contact tachometer with stable performance. Wide measuring range from 2.5 RPM to 99999 RPM and high resolution of 0.1 RPM or 1 RPM. High sampling rate, clear LCD display, high measurement accuracy. This tachometer can automatically record the max value, min value, and last value. With automatic range, low battery indication, and other functions. Wide range of applications in the fields of motors, wheels, lathes, electric fans, paper manufacturing, plastics industry, washing machines, car manufacturing, etc.