Feature:Applying the MCU and electrooptical technology, can perform contact measurement of rotating & linear rolling speed efficiently.0.5-19999RPM, wide measuring range and high resolution.Large LCD display with clear reading.Automatically store for the MAX, Min and LAST value.Accessories convertible for different measurement.Equipped with convex channel lineal rate sensor, it is convenient for measuring the lineal rate of the wire, cable. ropes etc.Low battery indication so you can know when need to replace the battery.Solid structure built with durable electronic elements and light ABS plastic house Specification:BrandSMART SENSORModelAR925Measure range0.5-19999RPM0.05~19999.9m/min0.2~6560Ft/minResolution ratio0.1RPM, 1RPM 0.01m/min, 0.lm/min 1Ft/minMeasure error(0.05%+1 digitSampling frequency0.8SecMax/MinYesEquipped with multi sensorYesLow power noticeYesMeasure methodContactData lockYesLCD backlightYesWorking temperature0~50oStorage temperature-20~70Power3*1.5V AAA battery(Not include)Weight132gProduct size190*55*35mmPackage list:1 * Digital Tachometer(without battery)1 * User manual1 * Accessory(Bag)Note:The actual product color may deviate from the photo due to light.There may be a slight deviation in the measurement of product..