Feature:_x000D__x000D_Applying the MCU and electrooptical technology, can perform contact measurement of rotating & linear rolling speed efficiently. _x000D_0.5-19999RPM, wide measuring range and high resolution. _x000D_Large LCD display with clear reading. _x000D_Automatically store for the MAX, Min and LAST value. _x000D_Accessories convertible for different measurement. _x000D_Equipped with convex channel lineal rate sensor, it is convenient for measuring the lineal rate of the wire, cable. ropes etc. _x000D_Low battery indication so you can know when need to replace the battery. _x000D_Solid structure built with durable electronic elements and light ABS plastic house _x000D__x000D_Specification:_x000D_Brand SMART SENSOR _x000D_Model AR925 _x000D_Measure range 0.5-19999RPM _x000D_0.05~19999.9m/min _x000D_0.2~6560Ft/min _x000D_Resolution ratio 0.1RPM, 1RPM 0.01m/min, 0.lm/min 1Ft/min _x000D_Measure error (0.05%+1 digit _x000D_Sampling frequency 0.8Sec _x000D_Max/Min Yes _x000D_Equipped with multi sensor Yes _x000D_Low power notice Yes _x000D_Measure method Contact _x000D_Data lock Yes _x000D_LCD backlight Yes _x000D_Working temperature 0~50o _x000D_Storage temperature -20~70 _x000D_Power 3*1.5V AAA battery(Not include) _x000D_Weight 132g _x000D_Product size 190*55*35mm _x000D__x000D__x000D_Package list:_x000D_1 * Digital Tachometer(without battery)_x000D_1 * User manual_x000D_1 * Accessory(Bag)_x000D__x000D_Note:_x000D_The actual product color may deviate from the photo due to light._x000D_There may be a slight deviation in the measurement of product. 1Applying the MCU and electrooptical technology, can perform contact measurement of rotating & linear rolling speed efficiently. 20.5-19999RPM, wide measuring range and high resolution. 3Large LCD display with clear reading. 4Automatically store for the MAX, Min and LAST value. 5Accessories convertible for different measurement.