homemagnetic-baseswhat-is-a-magnetic-base What is a magnetic base? Chris 1st January 2019 181 Views SaveSavedRemoved 0 What is a magnetic base? Shop for Magnetic Bases A magnetic base is essentially a holder with a magnet that can be switched “on” and “off” It functions as a stand for items (commonly dial indicators) and can be fixed to magnetic surfaces. It also has adjusting arms to allow the user to set it in the best position (e.g. to set up a dial indicator and take an accurate reading).