For the money that Davis charges they could get the darn tipping bucket calibrated properly BEFORE it gets into a consumers hands! I have two Davis rain gauges. One part of the 6163 ISS and a separate stand alone unit that has yet to be mounted. Once I get my pole installed and move the Davis ISS to that, AND get the separate Davis rain gauge mounted at the CoCoRaHS recommended height of 2', I will be able to do some comparisons between the two new Davis gauges, one at 5', and one at 2'. Those readings will be compared to Mr. CoCo. If they are off by a lot, (I understand about all the variables) then Davis is going to re-calibrate them, not me.