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Indicates when to water and helps prevent over-watering.
Package indicates watering needs for over 100 plants. Push the 6-inch tester probe down as vertically as possible to about two-thirds of the depth of the container. Note the number that displays on the tester and match it to the watering number on the package. Water only when the number on the tester is the same or lower than the plant's ideal watering number.
For use in soil only -- not in liquids.
No batteries required.