MOISTURE_TESTER

Published:2009/7/20 20:06:00 Author:Jessie | From:SeekIC

Simple probe tells when plants need watering. Amount of moisture and minerals in soil together determine current available for LED. Almost full brilliance indicates adequate moisture, and no illumination means plant needs water badly. Probe can be No. 14 wire filed to point and centered with epoxy in 3/16-inch copper tubing, or simply two stiff probe wires about 1 inch apart.-W. L. MacDowell, The Violet Tester, 73 Magazine, May 1975, p 52-53.



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