Gauge pressure is the pressure relative to the local atmospheric or ambient pressure. Pressure is measured in any unit of force divided by any unit of area.
The gauges are are available in different ranges, in different measuring parameters and various types of materials.
Ranges are shown in bar and PSI and all different kind of common refrigerants. Combinations of the refrigerants can be made up to the customers choice.
Different kind of connections can be choosen as well as different kind of fixations.