This non-contact tachometer is a professional and practical engine speed measuring device for measuring revolutions by minute (RPM) with a wide measuring range and high resolution. It is featured with high precision measurement, fast measurement time and long detection distance up to 500mm (20inch) with laser. This tachometer is very easy to use by applying a reflective strip (3 included in the package) on the target object, then aims to mark it by laser beam. This tachometer has a wide range of applications, such as measuring the rotational speed of machine, motors, wheels, lathe for metal or wood cutting work, electric fan, manufacturing paper, plastic industry, chemical fiber, washing machines, automobile manufacturing, etc. Features: Non-Contact handheld digital photo tachometer with stable performance . Wide measuring range (2.5RPM to 99999 RPM) and high resolution (0.1RPM or 1RPM). Automatically record the MAX. The Min. value value and last value with low battery indication. Capable of measuring at distance of 2-20in (50-500mm) with large LCD display. 0.8 second sampling time and 5 18mm digits LCD display with non-contact RPM measurement. Wide usage: usually can be used in the field of motors, wheels, lathe for metal or wood cutting work, electric fan, paper making, l plastic industry, chemical fibers, washing machines, etc. car do Features: Color: Dark gray Material: ABS PLASTIC Display: 5 digits 18mm (0.7") LCD display Measuring range: 2.5RPM - 99,999RPM Resolution: 0.1RPM at 2.5-999.9RPM, 1RPM at 1000-99,999RPM Accuracy: (0.05% + 1 digit) Measuring distance: 50-500mm / 2-20in Time base: 6MHz Crystal Oscillator Test Range Select: Automatic switching Sampling time: 0.8s (more than 60rpm) Function: Show last value, MAX. Value, Min. Value Power supply: 1 * 9V 6F22 battery (not included) Power consumption: approx. 30mA Operating temperature: 0 -50 (32 -122) Product size: 130 * 70 * 29mm / 5.12 * 2.76 * 1.14in Product weight: 79g / 2.80 oz Package size: 15 * 9.3 * 5cm / 5.91 * 3.66 * 1.97in Package weight: 113g / 4.00 oz Note: 1. You need to stick the reflective strip on the target object before measuring. 2. Do not direct the laser beam at the eyes directly; Safety glasses is recommended. 3. Do not use near explosive gases or in other potentially explosive areas. Package List: 1 * Digital Tachometer 3 * Reflective Strip Marks 1 * User Manual (English)