UNI-T UT60B

Hello! Some years ago I bought this multimeter from UNI-T. The problem is that it doesn't go down to 0 when I am trying to measure capacitor. Even if I unplug the cables the value is 1.12nF. On the internet I found the diagram of the device. I am trying to understand if I adjust VR3 from 17 pin I will go to the normal 0. The multimeter has been having this problem since it was new.
 

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