Portable Non contact Reflective Mark Microcomputer Digital Laser Photo Tachometer Range 2.5 to 99.999 RPM TesterSpecifics: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 measureIn 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 RPMResolution: 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 inchMemory: Last Value. Max Value. Min RPMPackageIncluded:1 x New Digital Laser Photo Tachometer( Battery 9V NOT include )1 x English Manual3 x approx.20cm of reflective stripes