Soil moisture meter
(Library Of Things)

Title from container.

The XLUX T10 Moisture Meter tells you, instantly, whether your plants need water. With this meter, you will know that sometimes though the top of the soil looks dry, just beneath the surface it's very wet--no wonder the plants are struggling. It's very easy to use, just stick it in the dirt and the dial instantly tells you whether the soil is dry, moist or wet. Batteries not required. Do not use to test very hard soil, clean after each use, never test water or other liquid directly.