This tachometer is a instrument to measure the Rotational ( ) with wide measuring range and high resolution. It is featured with high accuracy measurement, quick measuring time and wide detecting range from 2.5 to 99,999 with . Can be used to measure rotating of , motors, model cars, wheels, lathe for metal or wood work etc. Features - - Material: Plastic. - Size: About 12.5x6.5x2.5cm - Display: 5- 18mm high-resolution LCD - Test range: 2.5 ~99,999 ( / min) - Resolution: 0.1 ( / min) (2.5 ~ 999.9 ) 1 ( / min) (1000 or more) - Measurement accuracy: ± (0.05% +1 words) - Sampling time: 0.8 seconds (60 or more) - Effective measuring distance: 50mm~500mm ( source) - Time base: 6MHz quartz crystal oscillator - Range selection: automatic switching - Power: Single 6F22 9V battery - Power consumption: about 35mA - Full battery powered, no extra power connect required. - Measures with high accurate. - Large LCD displaying. Wide measuring range high resolution. - Mini size, hand held, let you use it more easily. - Last, minimum, and maximum readings will be automatically stored and can be displayed by turn anytime. - Automatically remember the maximum, minimum, and last measured values - The housing has been carefully shaped to fit comfortably in either hand. - Warm Tip: Dear buyer, Due to lighting effect, monitor’s brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Package list: 1 x Tachometer