The Sill's 3-in-1 Soil Moisture Meter
$15
The 3-in-1 Soil Moisture Meter ensures the health and quality of your plants by helping you know when to water, control pH level and light. To use stick the probe 2-4 inches into the soil and adjust until the dial swings. After 10 minutes note the moisture/pH/light level in the dial. Remove and wipe clean after use.