Specifications: Non-contact digital tachometer with stable performance. LCD display with white backlight, easy to read the measurement results. With auto-zero adjustment function, convenient for use. Item Name: Digital Tachometer Material: ABS Color: Sent by Random Measurement Range: 2.5-99999RPM Resolution: 0.1RPM (at 2.5-999.9RPM), 1RPM (at 1000-99999RPM) Accuracy: ±0.02% + 1 Digit Measurement Distance: 50-500mm Response Time: 0.5s (above 120RPM) Operating Temperature: 0-50 Degree Celsius (32-122 Degree Fahrenheit) Operating Humidity: 10% - 90% RH Storage Temperature: -10-60 Degree Celsius (14-140 Degree Fahrenheit) Storage Humidity: 10% - 75% RH Batetry: 1 x 6F22 9V Battery (Not Included) Functions: Automatic & Manual Measurement Modes, Data Storage & Display, Mini. & Max. & Average Recording, Time Interval Setting, LCD Display with White Backlight, Time Keeping, Automatic & Manual Shutdown, Low Power Display Features: Portable, Handheld, Digital Display, Backlight Size: 14.5cm x 9cm x 3.5cm/5.71" x 3.54" x 1.38" (Approx.) Notes: The color of this product is sent by random, and each one is nice. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: (Battery Not Included) 1 x Digital Tachometer