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The measurements have been carried out using a scale with sufficient precision, capable to appreciate the hundredth of a gram, first weighing the pen completely discharged, washed and totally dried (to avoid even the small error possibly introduced by the remaining ink in the [[feeder]]) and then loaded with water. For a comparison that takes into account the liquid remaining in the feeder, the weight was measured several times starting from the first empty and dry loading, repeating the loading and unloading cycles.

The measurements have been carried out using a scale with sufficient precision, capable to appreciate the hundredth of a gram (of those for weighing gold and jewellery, that you can find for about ten euros on the internet). To give an idea of the order of magnitude, a drop of water from a dropper is between 2 and 4 centigrams.