(tag changed)

I've used a 4-20mA depth gauge that measured to 6m to a
couple of mm (their words)

It was a long thin (6-7mm) yellow hose containing the wires and I
believe a Honeywell pressure sensor at the sealed end. Comparing
the output to a ruler showed it was pretty accurate, bearing in mind
inaccuracies of the PIC's ADC

Joe


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