ECOWITT WH51 Wireless Soil Moisture Sensor (+ GW1100 Gateway) Review (2026)
By Nate Sawyer, Editor · Updated July 2026
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- Monitoring plant health
- Multi zone monitoring
- Data driven watering
A scalable soil-moisture monitoring system for data-driven gardeners: cheap per sensor, up to 16 on one gateway, with a free app. It reports moisture but does not water - pair it with a smart controller or timer for action. A basic $10-15 3-in-1 probe meter is the low-tech alternative for spot checks.
Pros
- One gateway tracks up to 16 sensors, so you can monitor many beds or pots at low cost per zone
- Free WSView Plus app plus long-range 915 MHz radio reaches sensors far from the house
- Individual sensors are inexpensive, making whole-yard soil monitoring affordable to scale
Cons
- The sensor cannot be used alone - it requires a separately purchased Wi-Fi gateway
- It only monitors; it does not open a valve or control watering by itself
- App and pairing setup are less beginner-friendly than a stick-in 3-in-1 meter
Specifications
| Type | Wireless soil moisture sensor + Wi-Fi gateway system |
|---|---|
| Connectivity | 915 MHz RF to GW1100/GW2000 gateway (sold separately) + WSView Plus app |
| Range | Up to ~100 m line-of-sight to gateway |
| Capacity | One gateway supports up to 16 WH51 sensors |
| Best for | Monitoring soil moisture across beds, pots or a whole yard |
Frequently Asked Questions
- Does the WH51 sensor work on its own?
- No — it needs a separately purchased Wi-Fi gateway (GW1100 or GW2000). Buying the sensor alone leaves you with nothing usable, which is the most common ordering mistake.
- How many zones can you monitor?
- One gateway supports up to 16 WH51 sensors over 915 MHz with roughly 100 m line-of-sight range, so whole-yard monitoring scales cheaply once the gateway is paid for.
- Will it water the garden automatically?
- No. It monitors only — it does not open a valve or control irrigation. Pair it with a separate timer if you want the data to act on anything. Setup is also less beginner-friendly than a stick-in 3-in-1 meter.