Features: The RPM of motors and machine parts. Wide measuring range & high resolution. The last value/min . value will be automatically stored in memory and can be displayed by turn anytime. The housing has been carefully shaped to fit comfortably in either hand. Digital display gives exact RPM with on guessing or errors. It is a great tool to measure In wood and metal working it can be used to accurately measure the speed of a lathe. Display: Large 5 digit, 18mm LCD. Test select: Automatic. Range: 2.5 to 99,999 RPM Resolution: 0.1 RPM (from 2.5 to 999.9 RPM) 1 RPM (over 1,000 RPM) Accuracy: +/-( 0.05% +1 digit) Distance: 50 to 500mm/ 2 to 20 inch Memory: Last Value, Max Value, Min RPM Size: As the Pictures Power: 1 x 6F22 Battery 9V ( Not included ) Package Included: 1 x Digital Laser Photo Tachometer