RAINPOINT Wireless Soil Moisture Sensor with Capacitive Probe
4.3 ★ · 53 reviews
$43.49reference price
View on AmazonWhat is it and what's it for?
It's a probe you bury in the soil that 'feels' how much water is down there, like a thermometer but for moisture. It uses a 'capacitive' probe (measures via electric field, not metal corrosion), which lasts far longer than cheap probes that rust over time.
Real-world use cases
- At home: You bury it near a plant that keeps dying from over- or under-watering, and now you know objectively whether it needs water instead of watering 'just because.'
- In a business or workshop: A nursery can stick several probes into different beds to know exactly which ones need water that day, instead of watering everything the same and wasting water.
How to avoid buying the wrong one
- It absolutely needs the same-brand (RAINPOINT) WiFi hub to send data to your phone in real time — without the hub, it only works as a local probe.
- It's designed to stay buried permanently, not to be moved from pot to pot and pulled out afterward.
- If you already have an irrigation controller from another brand, this sensor doesn't connect to it — it's a separate monitoring device.
The investment takeaway
A capacitive probe costs more than a generic resistive one, but it doesn't corrode over time (resistive ones do, and start giving false readings within months) — for a sensor that's staying buried for years, the durability justifies the price difference.
Field glossary
Terms you'll hear about this equipment
So you can use the right vocabulary with a customer, a supplier, or a manual.
- Capacitive Probe — Sonda capacitiva
- Mide humedad usando un campo eléctrico en vez de contacto metálico directo — por eso no se corroe con el tiempo como las sondas más baratas.