Feature:1. 2 IN 1 CONTACT AND PHOTOELECTRIC TACHOMETER: The digital tachometer integrates 2 measurement methods, contact and photoelectric non contact. The tachometer can be used for photoelectric speed measurement, light source scintillation frequency measurement, contact speed measurement and contact linear speed measurement2. ACCURATE AND UNIVERSAL: Tachometer can be widely used in motor, fan, paper, plastic, chemical fiber, washing machine, automobile, aircraft, ships and other manufacturing industries, especially with different rubber contact wheels can meet the user in any occasion to accurately measure the contact speed3. 4 CONTACT PROBE OPTIONS: The tachometer is equipped with 4 different contact probes, which can be selected according to different scenes to achieve close contact with the object being measured. RPM tachometer is suitable for measuring the speed of conveyor belts, levels, pulleys, etc.4. CLEAR LCD: The digital tachometer is equipped with a large LCD display for clear reading, very convenient5. DATA RETENTION: The digital tachometer features a high definition backlit display that can be read clearly even in dark conditions and automatically saves the maximum, minimum and holds the last value, so you don't need to worry about shutting down due to low power consumption or unexpected power outagesSpecification:Item Type: TachometerBattery: 4 x 1.5V AA battery(not included)Features:Photoelectric contact tachometer or line tachometer5 bit large screen LCD display, word height 18mmWide measuring range and high accuracy10 new surface speed sensors with groove type slots for easy measurement of wire, cable and rope speed and lengthRangeNon contact speed2.5~99999 RPMContact speed0.5~19999 RPMContact line speed (metric)0.05~1999.9 meter/minResolutionNon contact speed0.1 RPM (2.5~999.9 RPM)1 RPM (over 1000 RPM)Contact speed0.1 RPM (0.5~999.9 RPM)1 RPM (over 1000 RPM)Contact line speed (metric)0.01 meter/min (0.05~99.99 meter/min)0.1meter/min (more than 100meter/min)Accuracy (0.05%+1Effective distance50~500mmMemory functionMaximum value, minimum value, last value (automatically store 96 groups of data)Sampling rate0.8 seconds (above 60 RPM)Low battery indicationWorking currentAbout 65mATiming6MHZ quartz crystalTiming accuracy10x10 to the minus sixth power (0~50)Maximum display99999Operation modeFree conversion.Package List:1 x Tachometer4 x Accessories1 x User Manual2 x Reflective Paper1 x Black Bag2 x Screw