["Digital Tachometer Rotational Speed Meter Tach RPM Tester LCD Display Motor Non-Contact Photoelectric Speedometer\n\nDescription:\nfor SMART SENSOR AR926 tachometer (RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. The device usually displays the revolutions per minute (RPM) on a digital displays.\n\nFeatures:\nbrand new and high quality.\n★Applying the MCU and electrooptical technology, can perform contact measurement of rotating & linear rolling speed efficiently.\n★Wide measuring range and high resolution.\n★Large LCD display.\n★Automatically store for the MAX, Min and LAST value.\n★Accessories convertible for differenet measurement.\n★Equipped with convex channel lineal rate sensor, it is convenient for measuring the lineal rate of the wire, cable. ropes etc.\n★Low batery indication so you can know when need to charger the units.\n★Legant and easy to use, solid structure built with durable electronic elements and light ABS plastic house.\n\nSpecification:\nColor: black\nMaterial: ABS\nSize: 13.5cm/5.31\"×4.7cm/1.85\"×2.5cm/0.98\"\nMeasuring range: 2.5~99999RPM\nRotating speed resolution: 0.1RPM (2.5~999.9RPM)/1RPM (Over 1000RPM)\nMeasuring distance: 50mm~500mm\nAccuracy: ±(0.05%+1 digits )\nSampling time: 0.8 sec (Over 60RPM)\nPower: 3*1.5V AAA battery (not included)\nMax / Min Measuring, Data Storage, Memories Clear, Range Selection Auto, Battery Indication\n\nNote:\nTransition: 1cm=10mm=0.39inch\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage Includes:\n1 x Digital Tachometer\n1 x User Manual\n1 x Nylon Bag"]