HOW TO CHANGE BATTERIES IN A MARK IV PRE PASS?

To change the batteries in a Mark IV Pre Pass, first ensure the device is powered off to avoid any electrical issues. Locate the battery compartment, which is typically on the back or underside of the unit, and open it. Remove the old batteries, noting their orientation, and replace them with fresh batteries, ensuring they are installed correctly. Finally, close the compartment and power the device back on to verify it’s functioning properly.