The Orchid Doctor Articles under the Heading Hygrometers

Hygrometers Comments
HYGROMETERS: Wet and Dry Bulb One deg. F. depression on the wet bulb equals 5% drop in humidity from 100%; if the wet bulb reads 62 deg. F. then the relative humidity is 100 less 15 or 85%; keep the water supply in the bulb adequate and replace the wick when rotted or polluted with algae. OR75-341 0

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