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Default DMM acting flaky

I've got a Rat Shack (micronta) 22-174B that I use for my hobby, which
is building guitar effect pedals. It's a cheap unit, but it's got the
functions that I need, such as a capacitance meter, hfe, etc.
Anyhow, I can't get good ohm resistance readings at all anymore. It is
way off. And the continuity tester beeps if I hold both a lead in each
hand.
I put in fresh batteries, the internal fuses are good, etc.
Anyone has an idea?