Hom much water does it take to tip the rain bucket in the VP2? (FAQ)
The tipping spoon should tip at the following points.
If the unit is a US version the spoon should tip at or about, 5.4ml
If the unit is a Metric version the spoon should tip at or about, 4.3ml
We do NOT recommend calibrate using this number. This is strictly provided for knowledge reasons for the scientific community.