Three seconds to a reading.

Our meters are based on a simple principle: metal probes conduct electricity differently depending on how much moisture is in the soil. The wetter the soil, the better the conductivity — and the higher the reading on the scale. No batteries needed. The soil does the work.

Step 1 — Push it in

Insert the probe into the soil at an angle, towards the root zone. For most houseplants, aim for the middle third of the pot — not the surface, where the soil dries fastest, and not the very bottom, where water can collect. For large pots, use our Deep Root Meter to reach deeper.

Avoid pushing the probe directly against the pot wall or a large root, as this can affect the reading.

Step 2 — Read the scale

Wait two to three seconds until the needle stops. The scale ranges from 1 (very dry) to 10 (saturated). Most houseplants thrive with a reading between 3 and 5 before watering. Succulents and cacti prefer it drier — closer to 2. Tropical plants and ferns prefer it slightly higher, around 4 to 6.

If you're using the 3-in-1 meter, switch the slider to check pH and light values as well. Ideal soil pH for most houseplants is between 6.0 and 7.0.

Step 3 — Water with intent

If the reading is below the plant's preferred level, water thoroughly until it drains from the bottom. If it's within the level, put down the watering can and come back tomorrow. That's it.

Over time, you'll develop a feel for each plant's rhythm — how quickly it dries out, how it reacts to the seasons, what it truly needs. The meter just gives you a starting point.

Care for your meter

Wipe the probe with a dry cloth after each use. Do not leave the probe in the soil for extended periods, as this can affect calibration. Store dry. See our Care Guide for full instructions.