I bought the regular USA ohm meter, and just discovered that my Ego One Mini's 510 connection doesn't make contact when threaded into the meter. I guess because the meter's 510 socket isn't spring loaded. Just an FYI.
I can nonetheless still measure the resistance of my
coils by holding the coil assembly by itself in the meter's 510 socket.
As to the variations in the above video, they seem perfectly normal to me. I wouldn't worry about a slight jumping around like that.