| 摘要 |
A plant watering indicator device comprises an elongate member which is insertable into soil and which has a layer of hygroscopic material, calcium hydroxide, disposed thereon. At the end of the member not inserted into the soil there is a transparent plastic film, which is a different color from the member attached to the member and which covers the calcium hydroxide layer thereat. There is a gap in the calcium hydroxide layer disposed beneath the plastic film. In use the indicator is inserted into the soil and, if sufficient water is present, the water is attracted up between the film and the member and the calcium hydroxide changes from opaque to translucent whereby the color of the member is contrasted against the color of film above the gap, giving a visual indication of the water content of the plant.
|
