Lisle 64970 Parasitic Drain Tester Replaceable in-line fuses protect both the meter and tester in the event a high current source on the vehicle is left on The multimeter is bypassed with the switch during connection in case of a power surge The tester and meter can remain connected until other computer systems shut down, isolating the drain As a convenience, stacking banana connectors are used on the tester This allows voltage to be measured on various locations on the vehicle during the drain test, using standard test leads