Here are three of the leaf wetness sensors I will be looking at. The dark green one is plastic coated, the middle one is a resistance sensor and I have sprayed it with a coating of latex paint, and the right sensor is a device which uses filter paper or felt to make the connection between the electrodes.
This is one of the data loggers I will be wiring up to collect the data from the sensors:
This is the stand I made last week on which to mount the sensors:
Here is my office space! More data loggers and bits and bobs for stands, batteries and other stuff:
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