I have a graduated cylinder that came with the rain gauge / collector. So...fill the rain gauge tube and measure carefully, then pour in warm water to melt the snow in the cylinder. When its all melted, measure everything in the graduated cylinder again and subtract out what you added. Sometimes I'll add 2 graduated cylinders. So if I add say, 0.90" water twice to melt the snow, ill subtract out the 1.80" of water I added from the final total. Just have to be careful to not spill or mismeasure. Better than waiting for it to melt....