Presto Pressure canner VS All American.

rhines81 · August 17, 2015

Yes frdlturner - just hook them up in tandem and assume that when his gauge is 16 psig (worst case), that your gauge is pointing to its 15 psig point (could actually be pointing at 13psig) and mark the location of your needle with a sharpie. Test it 3-5 times (for repeatability) before you make the final mark.
Always test on the high side of the accuracy band, otherwise you are aiming for under-pressure.
The more accurate the test gauge, the better. The accuracy stated is almost always based on the full scale of the gauge. A 3% gauge 0-30psig is just as accurate as a 1.5% gauge o-60 psig - theoretically.

It would even be better if his gauge was calibrated to a standard that indicates his gauge reading when the actual pressure is 15 psig, but we can't all be that lucky.

August 17, 2015	#11
rhines81 Tomatovillian™ Join Date: Mar 2015 Location: Zone 5A, Poconos Posts: 959	Yes frdlturner - just hook them up in tandem and assume that when his gauge is 16 psig (worst case), that your gauge is pointing to its 15 psig point (could actually be pointing at 13psig) and mark the location of your needle with a sharpie. Test it 3-5 times (for repeatability) before you make the final mark. Always test on the high side of the accuracy band, otherwise you are aiming for under-pressure. The more accurate the test gauge, the better. The accuracy stated is almost always based on the full scale of the gauge. A 3% gauge 0-30psig is just as accurate as a 1.5% gauge o-60 psig - theoretically. It would even be better if his gauge was calibrated to a standard that indicates his gauge reading when the actual pressure is 15 psig, but we can't all be that lucky. Last edited by rhines81; August 17, 2015 at 10:09 PM.