FYI a "fluid ounce" (liquid volume measurement) is very close to a "dry ounce" (weight) for water, so if you have an accurate scale, you can weigh a wet diaper and compare that to the weight of a dry diaper of the same type and subtract to get a fairly close estimate.
Accurate scales are handy to have around the house for many things. I use a food scale to get precision measurements on lighter things, and it works well to measure dry diapers to high precision. I can typically get 2 or 3 diapers on it without it overloading (depending on the diaper of course) and then divide by the count to get an accurate weight. Diapers can vary a bit, a safari for example can be between 8.35 and 8.55 oz, the same as an inspire+incontrol. The plain inspire (or spoiled) is more like 7.3-7.5, but a scale is almost required to tell an inspire apart from an inspire+incontrol due to being visually identical and very close in weight. IIRC that scale goes to 20 ounces, and displays to 1/100oz. I set a tall hard plastic cup on the scale before turning it on / zeroing it, so I can get the item I'm weighing up away from the display so it's not covered. (the top of the scale is only about 5"x5" and the display is directly below it, diapers easily cover the display and rest a bit on it, lightening the reading) The cup is light enough to not take away much of the capacity from the scale, and being hard plastic (not a springy material) it doesn't affect the weight reading.
When I want to get a decent precision measurement of heavier things, I use a small digital fish scale which is accurate to the ounce and has a capacity of 20 pounds. It's good for measuring a bag of diapers, where I can then divide by 10 or 12 or whatever and get a very accurate estimate of the average weight of a diaper. (I also use this if I feel like weighing a wet diaper, some of my sleep-in-weekend morning changes check in over 40oz
Don't forget to subtract the dry weight of the diaper for how much you actually wet overnight!) And
nowadays, the airlines have made luggage scales almost a necessity, but they tend to range higher and may not display ounces like the fish scale. (but they can be very inexpensive compared to a fish scale)
Entire cases can be weighed on a digital bathroom scale. They'd cover the display of course, so just weigh yourself, then pick up the case and weigh yourself again, and subtract for the difference. With 64 diapers in a case of ABU, that really multiplies up the precision on the per-diaper average. Come to think of it, I just got a new bathroom scale that sends weights to my phone, so technically I don't need to be able to see the display, hmmm....