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Fluke 71830G. Honeywell Marine. · IMPORTANT!
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When releasing pressure, first open the pressure relief valve and then open the shut-off valve. Rotate and pull out the switching valve knob, open the shut-off valve, adjust the pressure and pressure in a clockwise direction, close the pressure relief valve, and use a hand pump to pump pressure to the desired vacuum value.
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Druck DPI 312 Pressure Gauge Calibrator, have powered unit on , works to that point. I would say required servicing and calibrating . Comes in transit case.
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=====================================================. For more info you can search in internet.
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