I have three weather stations of different makes and each gives quite different amounts of rainfall. For example, yesterday, they gave respectively 2.0, 4.1 and 6.1 mm. The first two are the seesaw type, the first one being quite old and the buckets are corroded (new ones on order). The second bucket type is brand-new. The third rain gauge is acoustic and is also new. As numbers two and three are relatively new acquisitions, I’ve been thinking about checking the calibration of all three, without the means to do so super accurately. The way I was going to do it was by placing a 15 cm funnel in a tall glass, half buried in the ground. The collected water would then be weighed in a scale to