Another important influence of painting is that the sensor more closely mimics the thermal response of a leaf. While painted sensors may be more useful for measuring wetness periods caused by dew, it is unclear whether they are the most suitable for recording wetness periods caused by rain. Ideally, we can suggest three sensors. Penrose et al. Magarey et al.
Most reports suggest the top of the canopy .
The top of the canopy is the first to wet during rain or dew events and in most grape canopies there is a fairly uniform drying. The precision of the sensor also appears to be greater at the top. Recently Lau et al. We suggest the sensor should be tilted on it short axis at a 45 o angle to prevent excessive pooling of water during rain. However, other researchers have suggested the sensor should be mounted in a horizontal position.