The nature of water itself makes some aspects of testing water guns a bit difficult, but I feel good about the process overall. To start, we need to know how much water these things will hold. I do this by weight. Since 1 milliliter of water weighs 1 gram, it’s easy to measure capacity with a scale. After subtracting the empty blaster weights, you can see in the table below exactly how the capacities shake out. The Nerf Super Soaker Hydra has the overall largest capacity followed by its Super Soaker…
