I have a very small SPG on my Argon bottle. If you are looking for small they are about the size of the pressure relief on the same first stage. they read in 500 psi increments I bought them for about $50.00 canadian wich means we would have to pay you to take them in the US
But for stage bottles and my deteriating eye sight I use the OMS SPG's they have a nice atachment point on the holder and with a 6 inch whip work quite well.
But for stage bottles and my deteriating eye sight I use the OMS SPG's they have a nice atachment point on the holder and with a 6 inch whip work quite well.