| 摘要 |
<p>A watching device for use in watching a plant's cultivating condition comprises a pair of electrodes 2 inserted into or attached on a vein of the plant's leaves at a predetermined spacing, and a detector 3 for detecting a voltage generated across the pair of electrodes. The existing condition of the plants is watched by means of the detected voltage signal. An output device 4 indicates the voltage in an appropriate form eg printed on paper or as a sound through a loudspeaker. <IMAGE></p> |
