Wide Measuring range from 2.5 to 100000 RPM, Extremely Light Weight.Ideal For Shop Floor Working, Range : 2.5 to 99,999 RPM (rmin), Resolution : 0.1 RPM (2.5 to 999.9 RPM)-1 RPM (over 1,000 RPM),Memory : Last value, Max. Value, Min. Value. Detecting Distance : 50 to 200mm2 to10 inch (LED)-50 to 500mm2 to 20inch (Laser)