ECOWITT WH51 App Smart Soil Moisture Sensor
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Here is another tool that lets you keep a close eye on the health of your garden. The ECOWITT WH51 Soil Moisture Sensor can get a reading in 72 seconds. It combines with GW1000 WiFi gateway to bring you live data on your smartphone. You can get readings from up to 8 soil moisture sensors with one gateway.
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This sensor is IP66 waterproof rated, so you can use it indoors or outside. You can view past readings and graphs online. This soil sensor is available for under $20 at this time. More information is available here.
