Melnor Soil Moisture Sensor VF3300E(Automatic Rain Delay) Sensor only #17.

See pictures for more details.

As seen in the pictures.

Missing part.

About this item

• Overrides watering schedule when soil is at optimal moisture level

• Moisture sensor works with select AquaTimer models (sold separately)

• Helps conserve water and maintain healthy plants

• Controls valves on one AquaTimer or other compatible units

• Requires two AA batteries (not included)