Dry pressure gauges

Dry shop SPGs: DIR Store lists Scubatec and Polaris gauges for blending and transfer, not the 52 mm units you take in the water.

You find a surface gauge with or without a knob, DIN 300 fitting for HP hoses, a bare gauge, an HP transfer extension with or without gauge, and Viton and little QD BP gauges.

You use them in the compressor room or on the boat on the HP line, dry.

Regulator SPGs are in Pressure gauges; electronic Keller units are in Digital pressure gauges.