[JackieW]

1) How often do they need recalibrating?

2) Is it normal to have the dial set almost to as low as it will go?

Last few days I've finished at the back of a house, pulled univalve to stop flow, walked back to van and still find the pump running as shut off hasn't kicked in. Turn dial to  zero and after a few seconds it'll stop.

[andyM]

That doesn't sound right Jackie.
I can't remember the number the dial on mine is set at but it's around 1-2 o'clock if I remember correctly.