I think your numbers might be off...
Let me send you a large graduated cylinder, and a gallon of distilled water. Then you can drop each of your mods into the water to measure exact displacement. Just to be fair, you should leave the batteries in to ensure accurate displacement.
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Katdarling's swimming pool was out of commission when she started this thread, just about a year ago. We decided that a single HxWxD volume calculation was good enough for our purposes. We can leave displacement tests to Hydrogeology and Groundwater Modeling.



