Dial Indicator Set with On/Off Magnetic Base Precision measuring, set-up and inspection instrument for machinists, manufacturing, maintenance Magnetic base has 50-lb force for firm placement, on/off switch for easy mobility Polished chrome control arm, infinitely adjustable for exact alignment Travel dial indicator from 0.0" to 1.0", gradations of 0.001" Includes 9-1/2"H base with 6-1/2" control arm, dial indicator gauge and custom-fit protective case