A better way to calibrate the AcuRite rain gauge. The user manual suggests poking a hole in a paper cup of 8oz water. That should drip slowly (and constantly) into the gauge and yield 1.68" measured. This approach allows you for much longer calibrations (eliminating experimental error). Each ounce of water you drip in the calibration is equivalent to 1.68/8 == 0.21" measured. So if you drip 20oz, your gauge should show 4.2" rain.
