- Simple configuration change: switch from horizontal to vertical machines and from inner to outer diameters by a simple replacement of the inducer without any adjustments. While the machine spindle turns, the display remains stationary in any position, keeping both hands free to position the worktable with precision. - Accurate and versatile centering: measurement range 0 to 0.15 with a 0.0005 resolution. The CO-AX coaxial center indicator enables fast, precise centering for drilling and milling on horizontal or vertical machines. When the spindle is turning, the scale is oriented toward the operator for easy centering. - Centering gauge with center readout: the center-reading dial indicator is a new tool that uses a lever to transfer the relative position of the workpiece center to the dial and converts it into an angular movement of the pointer. It provides precise, practical, and highly visible measurement to locate the relative center of the workpiece, such as for the circumference and inner bore. - Mounting and capacity: shank 3/8 in. Capacity: 5/32 to 4-1/4 in inner diameter or 0 to 4-1/4 in outer diameter. Spindle speed: 100 rpm; exceeding this speed is not recommended. This is a professional indicator for locating the workpiece center on drilling or milling machines (alignment) and for determining the lateral center diameter.