Has a powerful magnetic base that attaches to flat surfaces or on round work up to 5" diameter by a form-ground involute vee for accurate seating. Magnetic Base and has a rotary on/off switch. Post snug with two 3/4" gripping holes positions the dial indicator at any height and at any vertical angle and allows for 360° rotation of the gage rod. A second tapped 3/8" hole in one side of the base is for mounting the post horizontally or adding another post for multiple inspection work. The base is furnished with a threaded adapter.