I almost hate to do this, but let's use the audible setting I showed you for a sec.
When you touch your two meter leads together, it beeps right? (actual tone, not looking at the numbers)
If so, you also get an audible beep between the 2 "M"'s right?
Same audible setting on meter.
Does it give you a tone from pinky side of boot to test wire?
I ask, because numbers jumping could be a touch of resistance in the length of wire, or your fingers touching the meter leads etc, but even with some jumping numbers you may STILL have connectivity.
That's why I like the audible tone setting. It's pretty clear if there's a connection or not.