Magnetic base indicator holders have a magnetic base that’s connected to an adjustable arm assembly used to mount and position indicators. Also called mag bases, they are always-on or have an on/off knob or button to mount to machines, motors, benches, or other metal surfaces.

These portable magnetic bases have a knob or button that is used to control their magnetic pull. They do not have arms but are built with a threaded socket on top so they can be paired with indicator holder arms with compatible threads.

Spindle-mounting centering arms for indicators have adjustable jointed arms and can be locked into place. They are mounted directly to a milling machine spindle. They have a shank that mounts directly and are typically compatible with 3/8”, 6mm, and 8mm indicator stems and used with lug or dovetail mounts.

Indicator holder arms pair with a compatible magnetic base to provide necessary flexibility and reach. Full arm assemblies have a threaded stud at the base of a rigid post-and-arm or jointed articulating arm assembly. These arms may include a fine adjustment knob and can include integral or optional indicator mounting attachments for common options such as 3/8" in AGD indicator stems, 6 mm and 8 mm ISO/JIS indicator stems, dovetail mounts for test indicators, or clamps for back lugs. Pair with a compatible base by series and the base thread size.

Vacuum base indicator holders have a powerful suction cup that provides stability on flat surfaces. These bases are paired with indicator holder arms with compatible threads. They are commonly used to mount an indicator holder on a nonferrous surface such as a surface plate or near critical electronics sensitive to magnetism.