Features: No-Contact handheld digital tachometer with stable performance. Automatic and manual measurement modes for selection. Wide measuring range(2.5 to 99999 RPM) and high resolution. MAX./MIN./AVG. values record function. Data hold function, data record and recall(60 readings). LCD screen with white backlight, easy to read. Capable of measuring at a distance from 2-20in(50-500mm). Auto and manual power off. Low battery indication. Specifications: Color: Blue / Red(Optional) Material: ABS PLastic Measuring Range: 2.5-99999 RPM Resolution: 0.1RPM at 2.5~999.9RPM; 1RPM at 1000~99,999RPM Accuracy: ±0.02%+1 digit Measuring Distance: 50~500mm / 2~20in Sampling Time: 0.5s(above 120RPM) Data Storage Capacity: 60 Readings Auto Power Off: After 20s Operation Temperature: 0 to 50℃(32 to 122℉) Operation Humidity: 10 to 90%RH Storage Temperature: -10 to 60℃(14 to 140℉) Storage Humidity: 10 to 75%RH Power Supply: 1 * 9V 6F22 Battery(NOT Included) Product Size: 145 * 90 * 35mm / 5.7 * 3.54 * 1.4in Product Weight: 79g / 2.81oz Package Size: 20 * 14 * 4cm / 7.87 * 5.5 * 1.57in Package Weight: 134g / 4.73oz 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 1 * Reflective Tape 1 * User Manual(English)