For use with Regulators for setting Output Pressure. These are graduated both in BARS & PSI with a max. Reading of 200PSI/14 BAR. Pressure Gauge is graduated in intervals of 5 PSI/0.20 BAR and is accurate to within 5% These have male threads on the center back & fit female threads on the Regulator Gauge has a steel casing with clear glass lens and internal components made from Brass