Right these two are the Dunlop. Side ends of the sensor terminals.
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These are both relatively smooth when reading on middle/side pins moving the arm but they do both go out of range at the higher end and one goes down to 200 but then jumps back to 900 so that might be buggered. The other one doesn't do that at the lower end but does cut off at the top end
And this is the cheap one.
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The readings from the side/middle terminals while moving the arm are all over the place.
Definitely rubbish...