How does the Weather Watcher sensor compare to leaf type sensors?
A About 20 years ago we used to make a leaf type sensor which relied on the electrical conductivity of a piece of blotting paper varying as it became wet. This worked well but suffered from the same problems as most leaf sensors on the market today regardless of the leaf sensor material. Namely, iron and salts in the water get left behind as the water evaporates off the sensor causing the leaf to go out of calibration and a broken leaf element will usually be interpreted as dry and not wet resulting in far too much water being applied until the problem is rectified.
