23-04-13, 12:19 PM
These are not mercury, they have stainless rods in them and actually work by drawing a small bit of air over them so by rights, they are actually a flow meter not a vacuum gauge.
A mercury manometer is the 'laboratory standard' and as long as the column does not get split does not need calibration.
I intend to re-do mine with dial type vac gauges, cause as yet I have not seen all 4 up at the same time (that means anything) :rolleyes . And will keep my T pieces in my Fazer box of bits, don't intend to get caught out like that again
A mercury manometer is the 'laboratory standard' and as long as the column does not get split does not need calibration.
I intend to re-do mine with dial type vac gauges, cause as yet I have not seen all 4 up at the same time (that means anything) :rolleyes . And will keep my T pieces in my Fazer box of bits, don't intend to get caught out like that again