Features: Automatically store max value and min value. With wide measuring range from 10 to 99999 r/min and high accuracy. Non-contact measurement can solve measuring problems of some tested objects which is easy to deform. Large LCD screen with backlight, clear reading and convenient to measure in dark environment. Support auto ranging, auto power off, data hold, overrange display, low battery indication and other functions. Specifications: Measuring Range: 10~99999RPM Resolution: 0.1RPM (10~9999.9RPM), 1RPM (10000RPM or more) Error: 0.04% Counting Range: 0~99999 Measuring Distance: 50~200mm Battery: 3 x 1.5V AA Battery (Not included) Battery Life: About 40h Color: Red + Black Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Digital Tachometer