Description span style=font-size: 18px;Features/span/ppspan style=font-size: 18px;Non-contact Tachometer: Measure RPM with photoelectric Precision, Suitable for Large and Small Engines/span/ppspan style=font-size: 18px;High Precision: for Instant Readings with (0.05% + 1 RPM) Accuracy, Fast Sampling Time/span/ppspan style=font-size: 18px;Multi-function LED Backlight: Easy Reading in Dark, Store Latest, Minimum, and Maximum Readings/span/ppspan style=font-size: 18px;Wide Application: Measure Speed of Motors, Fans, Pumps, Turbines, Gears, and More/span/ppspan style=font-size: 18px;Complete Tool Kit: Includes Tachometer, Batteries, Reflective Markers, Box, and User Manual/span/ppbr//ppspan style=font-size: 18px;Specification:/span/ppspan style=font-size: 18px;Part Name: Digital Tachometer/span/ppspan style=font-size: 18px;Color: Black/Red/span/ppspan style=font-size: 18px;Material: Plastic/span/ppspan style=font-size: 18px;Model: TA500A/span/ppspan style=font-size: 18px;Measuring way: non-contact/span/ppspan style=font-size: 18px;Measuring range: 3-100000RPM/span/ppspan style=font-size: 18px;Accuracy: (0.05%FS+1RPM)/span/ppspan style=font-size: 18px;Resolution: RPM: 10000: 0.1, RPM: 10000: 1/span/ppspan style=font-size: 18px;Speed display: six-digit display, maximum 99999/span/ppspan style=font-size: 18px;Effective measurement distance: 50mm~500mm/span/ppspan style=font-size: 18px;Sampling time: 0.8 seconds (above 60 rpm)/span/ppspan style=font-size: 18px;Automatic shutdown: 15 minutes (can be turned off manually)/span/ppspan style=font-size: 18px;Usage environment: -10~50, maximum 80% relative humidity, indoor altitude 2000m/span/ppspan style=font-size: 18px;Storage environment: -10~50, maximum 70% relative humidity (remove the battery)/span/ppspan style=font-size: 18px;Power supply: 21.5V AAA (R03/LR03) (not included)/span/ppspan style=font-size: 18px;Size: 130x59x29mm/span/ppspan style=font-size: 18px;Display size: 34 x 31mm/span/ppspan style=font-size: 18px;Weight: about 110g (without battery)/span/ppbr//ppspan style=font-size: 18px;Package Content:/span/ppspan style=font-size: 18px;1*Digital Tachometer/span/ppspan style=font-size: 18px;1*Instruction Manual/span/ppbr//p