UNI-T UT600 Capacitance meter?

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I've gotten one of these for free and can't figure out how to use it, it might be broken(that's why I got it free).

The values jump all over the place, no matter how I try to use the "zero" knob.

Tried to measure a brand new Mundorf Mcap 8,2uF, values jumps relatively close to that capacitance for a while then they start rising. almost imposible to keep within the 20uF range...sooner or later the overload (-1) symbol appears.

Already checked the fuse and put a fresh battery in it.

Any advise is greatly appreciated!

Capacitance_meter_1.jpg
 
I've tried measuring a 1000pF russian mil.spec silver mica too.

Closest range I got without getting the overload symbol in seconds was the 20uF range for a 8,2uF Mcap. But it only showed 8,2uF what appeared to be randomly a few times, and no longer than the other values it jumped between.
After a while it always climbs up while jumping from value to value on the display.
 
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