Bonsai Trees The water meter test.
There are several new devices, generally called "electronic moisture meters," designed to measure the moisture present in your house plant's potting mix. Water meters all operate on a similar principle: they record the flow of a very weak electric current generated by a small battery or by a chemical reaction to moist soil. In most cases, the more moisture present in the soil, the stronger the flow of electric current.
To use such a meter, push the probe into the soil in the plant's container and wait for the signal. Try several readings on each plant at different soil depths to get an accurate idea of overall water content. Water meters are available from nurseries, garden centers, and mail-order garden supply firms.
Whichever type of meter you purchase, follow the directions carefully and be alert for its shortcomings. You may get inaccurate readings if you water with distilled water or if there is a salt buildup in the potting mix. If your meter is battery operated, the battery could be weak or dead. So, should a house plant look wilted and have soil that appears bone dry, give it some . water regardless of the water meter's message.
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