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This probe comes in 2 versions: NC or NO.

The NO version uses a npn (s8050) output transistor and the NC uses a pnp transistor. Perhaps (??) version NC or NO relate to the transistor state. But...

How do you connect the display trim pot? Steve PCB2 shows 4 holes ( 3 holes negative and one to pin 3 on display). Does one outer leg of the trim pot go to pin 3 and the middle and other outer to...