Modifiche

We measured several times (around 10) both the weight when the pen is loaded and when the pen is unloaded; the latter is used to estimate how much liquid remains in the [[feeder]], but we took as an indication of the filling capacity the value with the pen fully filled, because pens are filled once the ink is finished and no longer reaches the nib, and this also includes the one present in the feeder. From the various measurements we obtained average and standard deviation.

The value when the pen is discharged used to estimate how much liquid remains in the [[feeder]], but we took as an indication of the filling capacity the value when the pen is fully filled, because pens are filled once the ink is finished and no longer reaches the nib, and this also includes the one present in the feeder. However, you can use the weight of the unfilled pen for a fairer comparison with the capacity of the cartridges, as it indicates the capacity of the filling system alone (with cartridges the additional capacity of the ink held by the feeder when it is immersed in the ink bottle to charge the pen is not available; this is a limitation in the use of cartridges, other filling system provide this additional capacity).