New Handheld Non-Contact Digital Tachometer Tach RPM Tester Measuring Device Tool TA8142 High Performance 2.5~99,999RPM Features: Compact design, easy to carry and use Non-contact Laser photo way Wide measuring Range 2.5RPM~99,999RPM, high-resolution Automatic measurement and manual measuring The power of laser is of high and low selection to adapt the far and near distance Automatic to record 50 sets of data,and the sampling interval time could be changed Automatic to record the Max,Min and Average data Large LCD Display with backlight easy to work in the dark Auto power off after 30 seconds without operation