INSIZE Blade Micrometer Features include... 3-4" / 75-100mm Electronic Blade Micrometer Resolution: 0.001mm/0.00005" The anvil and spindle have blade tips to measure groove diameters of shafts and keyways Buttons: on/off, data set, mm/in, ABS/INC, data output SR44 Battery, with one spare battery, auto power off SPC Output Non-rotating spindle Sizes over 1" include standard rods Packed in plastic or wooden box Blade Dimensions... Width: 0.030" Height: 0.236" Length: 0.256"