Ideal for preventing the low pressures that can be destructive or cause malfunctions in equipment containers, storage vessels and pressure sensitive instruments, they have the additional benefit of an built-in humidity indicator to monitor internal relative humidity.
These units suit the many practical applications where a positive atmosphere of several bar within a vessel is the normal operating level and a negative pressure of just a few millibars could result in permanent damage. They will also protect equipment being transported in aircraft even under rapid decompression conditions