These Bourdon gauges have markings in both psi and kPa. 100 psi (690 kPa) is the green charged zone. The compatibility code on these gauges is A.
These gauges are for use on K-Class (Kitchen) fire extinguishers only. Models for dry chemical, Halon 1211, Halotron I, and water units are listed under Related Items below.
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Note: Gauges are calibrated against atmospheric pressure, which is indicated when the gauge reads zero. Thus, a cylinder pressure of 100 psi would move the pointer to 100. If there is a slow leak inside the case, however, and the pressure inside the *gauge* was 100 psi, the gauge would read zero. New gauges such as these have pressure relief devices which relieve case pressure at 50 psi or less. There are many ways of creating leaks and leaks are not the only things that cause gauges to give false readings, so care should be used when installing them.