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The hygrometer supplied with this desiccator cabinet is not a precision instrument. It registers high or low humidity, but it is not an accurate indicator of the percent of relative humidity in the cabinet. If the hygrometer reading changes to a lower value, then drying is taking place. If a more precise measure of the actual relative humidity in the cabinet is required, a portable, more accurate hygrometer may be placed in the cabinet and read through the door.
The Hygrometer dial should be checked against a known accurate hygrometer. If the reading is off, remove the dial from the door by pulling out the rubber ring, and reset it by turning the screw in the center of the back with a screwdriver. Another method of checking is to wrap the hygrometer in a wet cloth for a half hour. The pointer should read 94 to 96%. If it does not, readjust the instrument by turning the screw in the center of the back with a screwdriver. After recalibration, re-insert the dial into the door making sure that it is properly oriented for reading. Then replace the rubber ring.
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