*Accurately measure RPM from 2.5 to 9999 with a resolution of 0. RPM at 2.5 to 999.9 RPM and RPM at 1000 to 99,999 RPM. *Achieve precise measurements with an accuracy of +/- 0.02 percent and a measurement distance of 50-500 mm (2-20 inches) in just 0.5 seconds. *Enjoy easy-to-read results on a large LCD screen that displays the last, minimum, and maximum readings, with automatic point setting. *Measure the speed of engines, wheels, lathes, fans, paper-making machines, fibers, washing machines, plastic industry, automotive manufacturing, and more. Function Automatic and manual measurement modes Data recording (60 groups) and viewing mode Maximum, minimum and average value recording function Recording interval setting function LCD display with white backlight time keeping function Automatic and manual shutdown low battery display Specifications: Part Name: Infrared speedometer Color: as show Material: Plastic Size: 145*85*40mm Model: DT6685 Power supply: 1x6F22 9V battery(Not included) Measuring range: 2.5-99999RPM Resolution: 0.1RPM, at 2.5~999.9RPM; 1RPM, at 1000~99,999 RPM Accuracy: ±0.02%+1digital Measuring distance: 50~500mm Response time: 0.5s (above120RPM) Operating ambient temperature: 0 to 50oC (32 to 122oF) Operating environment humidity: 10 to 90%RH Storage temperature: -10 to 60oC (14 to 140oF) Storage humidity: 10 to 75%RH Note: . The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Package Contents: 1* Infrared speedometer 3* Reflective strips