Which one is accurate

[Philyoh]

I have a Ashcroft guage and a new Bob Long guage but when I put the ashcroft I would set it to 55 psi and when I swap to BL guage it only reads 40 psi which one is more accurate between the two?:confused:

[Stewey956]

Ashcroft.

[excessiveego]

the ashcroft is likely to be more accurate, as long as it is in good condition, and has never been over pressurised

[BigRed76]

Ashcroft is easier to read and thus more accurate. The more accurate gauge is technically the one that is perfectly zero when the marker has been degassed.

[DFSniper]

it depends. do both sit exactly at 0 when un-aired? my ashcroft sits at -10

[Philyoh]

i will check the difference later when I degass the marker

[SparkyGT]

i just bought a adaptor to test gauges, hooking up to air compressor, used gauges always make me wonder