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... here's a simple, cheap, straight forward protocol I hope
may be useful in the high school lab:
...
4) Connect each meter lead to one lead of a resistor of
at least 120 kilohms.
5) Heat the resistor red hot. (If the resistor goes open circuit,
you will see that the DVM drifts up to 100s of millivalts.
Replace the resistor in this case.)
6) Note the reading of 4, 5 or 6 millivolts.
7) Remove from flame and check that there is a readable resistance value.
8) Repeat from step 5)
This is a reasonable classroom exercise. Just a hint of danger to keep
the students interested.