Make a wooden hygrometer
Aus Open Source Ecology (OSE) Germany - Entwicklungsplattform
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Make a wooden hygrometer Basic Data Category: Hygrometer URL (first publication): https://www.youtube.com/watch?v=FCiltGTHANc
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Design files are in original format: No Free redistribution is allowed licence: No
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Description
How to make a hygrometer and hotbox. It will swell and shrink according to the condition of the air.
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