6 . SAE and METRIC SCALE .7 . BATTERY COMPARTMENT .8 . OUTPUT CONNECTOR .9 . LCD DISPLAY .10 . SLIDER CLAMP SCREW .11 . THUMB ROLLER .12 . ON / OFF SWITCH .13 . ZERO SWITCH .14 . SAE & METRIC CONVERSION SWITCH .1. OPERATION : SLIDER CAN BE REMOVED ONLY AFTER THE LOCKING SCREW ( # 10 ) IS LOOSENED . 2 . BASIC MEASURING METHODS :- 1 ) LOOSEN THE LOCKING SCREW 2 ) PRESS " ON " BUTTON , SELECT SAE OR METRIC MEASUREMENT BY PRESSING " MA / INCH " BUTTON . PRESSING " MM / INCH " BUTTON AFTER MEASUREMENT WILL DISPLAY THE SAE / METRIC CONVERSION . 3 ) TO RESET DISPLAY TO ZERO , CLOSE EXTERNAL MEASURING JAWS , THEN PRESS " ZERO " BUTTON .