Relative (REL) mode

Relative mode: Eliminate low resistance or impedance on the test leads during capacitance measurements
When a multimeter is used to measure resistance, the test leads will produce impedance. The probes should be short-circuited and the multimeter should enable the relative mode to eliminate the impedance. When the relative mode is enabled, the multimeter will store existing reading, reset display to zero and set a relative reference point to measure against the next reading.