Specifications: Color: Dark Grey Material: ABS PLastic Display: 5-digit 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(over 60RPM) Function: Display Last Value, MAX. Value, Min. Value Power Supply: 1 * 9V 6F22 Battery(NOT Included) Power Consumption: Approx. 30mA Working Temperature: 0℃-50℃(32℉-122℉) Product Size: 130 * 70 * 29mm / 5.12 * 2.76 * 1.14in Product Weight: 79g / 2.80oz Package Size: 15 * 9.3 * 5cm / 5.91 * 3.66 * 1.97in Package Weight: 113g / 4.00oz Note: 1. You must stick the reflective tape onto the target object before measuring. 2. Do not point the laser beam towards eyes directly; safety eyewear is recommended. 3. Do not use it near explosive gases or in other potentially explosive areas. Package List: 1 * Digital Tachometer 3 * Reflective Tape Marks 1 * User Manual(English)