The magnetic base (for holding measuring tools) is used for holding measuring tools such as dial gauges and indicators. Magnetic force can be turned on and off, making it easy to install and remove, and it can be attached and detached with the switching lever. In some cases, the vise part can be flexibly tilted, and the workpiece shape can be fixed according to the machining direction. Each magnetic base has various kinds of sticking surfaces such as the bottom, the rear as well as a V-shaped bottom surface that can attract cylindrical rods and pipes, so select according to the intended use. In addition, when selecting a holder base, it is necessary to check the presence or absence of a handle, mounting screw hole dimensions, and the strength of the magnet's pull force before selecting.