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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.

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.

First the pen was weighed completely empty, washed and left to dry completely so as to avoid any residue due to liquid remaining in the [[feeder]]. Left to dry completely means holding the pen upside down with the nib resting on a sheet of absorbent paper for at least a week, so as to exclude any residual water.

First the pen was weighed completely empty, washed and left to dry completely so as to avoid any residue due to ink remaining in the conductor. Left to dry completely means holding the pen upside down with the nib resting on a sheet of absorbent paper for at least a week, so as to exclude any residual water.

Poi si è caricata la penna con acqua corrente. Per un confronto che tenga conto del liquido che resta nell'alimentatore, il peso è stato misurato più volte a partire dal primo caricamento da completamente asciutta, sia dopo il caricamento che dopo averla scaricata, ripetendo più volte il ciclo di carica e scarica.

Poi si è caricata la penna con acqua corrente. Per un confronto che tenga conto del liquido che resta nell'alimentatore, il peso è stato misurato più volte a partire dal primo caricamento da completamente asciutta, sia dopo il caricamento che dopo averla scaricata, ripetendo più volte il ciclo di carica e scarica.