Here I recommend one from MiniInTheBox Company, a professional company focus on this kind of product.
Brief Introduction of Relay Module Soil Moisture Relay Soil Moisture Sensor Arduino Smart Car
Key FeaturesFeatures: - 1 This is a summary of the soil moisture sensor can be used to detect moisture, when the soil is dry, the relay off, relay and vice
- versa. Using this sensor make an automatic watering system, so that your garden plants without people to manage.
- 2 adjustable sensitivity
- 3 Operating voltage 3.3V-5V
- 4 relay outputs, control is more convenient.
- 5 with fixed bolt hole for easy installation
- 6 small plates PCB size: 3cm * 1.6cm
- 7 Power LED (red) and the relay and indicator (green)
- 8 using LM393 comparator chip, stable
- Small plates Interface Description (2-wire)
- 1 VCC external 3.3V-5V
... [Full description on MiniInTheBox]
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