Special Function Size 5 digit large LCD displaying,digit height is 18mm Measuring range 2.5~99999 Loop/minutes Resolution 0.1RPM (2.5~99999RPM) 1RPM (1000RPM ) Accuracy (0.05%+1D) Sample time 0.5 second(120RPM) Range select Automatic select(laser) Effective distance 50mm~500mm Working Current Max.40mA Memory Auto memory Max./Min./Last value Time Base 6MHz Power 9V (6F22) Battery Dimension Approx:1307029mm Net weiget Approx:132gChina