Right, not an easy test to rig up and test by yourself. I just checked my DMM (a Greenlee #93-606 I bough at the hardware store several years ago), and the continuity buzzer would sound even with 33+ ohms of resistance (I put 3 100-Ohm resistors in parallel.) The buzzer did not sound at 50-Ohms FWIW.
But we are looking for bad connections / grounds that are closer to 1-ohm, so checking the voltage drop across the suspect connection points at high current draw works better than testing with the meters continuity buzzer or ohms range.