磁性底座，一般用于量测仪器的固定，一般性量测仪器如千分表、角度规、震动计等，多半使用磁性座固定量具。

磁性底座外壳是两块铁，中间圆形永久磁铁，可方便地旋转的磁铁。可吸附在导磁性佳的铁材上面。

A magnetic base is a magnetic fixture based on a magnet that can effectively be turned "on" and "off" at will; they are often used in optics and metalworking, e.g., to hold a dial indicator.

The vertical post, side arm (as shown in the image at right) and the dial indicator (not shown) are connected by two swivelling connectors. These connectors allow free movement of the arms so that the indicator can be presented to the work in a suitable orientation. The magnetic base may have a "V" cut into the bottom of the base or the back, this "V" allows the base to be attached to a round bar such as the column of a drill press.