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The capacity in ml was then determined using the specific weight of the water which is 0,997 g/ml. The difference between tap water and pure water is below the appreciable limits of the measurement in centigrams, and inessential for the measurement whose accuracy is ±0.02 ml (sum of the systematic error of 0.01 g of the scale in the difference between two measurements, even if the error is always higher for a filled pen weight measurement), for the conversion, however, we can substantially assume an equivalence of 1 g => 1 ml being the difference below the measurement error.  
 
The capacity in ml was then determined using the specific weight of the water which is 0,997 g/ml. The difference between tap water and pure water is below the appreciable limits of the measurement in centigrams, and inessential for the measurement whose accuracy is ±0.02 ml (sum of the systematic error of 0.01 g of the scale in the difference between two measurements, even if the error is always higher for a filled pen weight measurement), for the conversion, however, we can substantially assume an equivalence of 1 g => 1 ml being the difference below the measurement error.  
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|-
 
|-
 
| [[Duofold]] ''De Luxe''||[[button filler|button]]|| 22,10 ± 0,01 g || 24,00 ±  0,03 g || 22.35 ± 0,03 g || 1.90 ± 0,04 ml
 
| [[Duofold]] ''De Luxe''||[[button filler|button]]|| 22,10 ± 0,01 g || 24,00 ±  0,03 g || 22.35 ± 0,03 g || 1.90 ± 0,04 ml
 +
|-
 +
| [[Lamy 2000]] ('60s) ||[[piston filler|piston]]|| 20,88 ± 0,01 g || 22,68 ± 0,02 g ||  21,59 ± 0,02 g || 1.80 ± 0,03 ml
 
|-
 
|-
 
| [[Deco Band]]  || [[lever filler|lever]]  || 22,82 ± 0,01 g ||  ±  g ||  ±  g ||  ± ml
 
| [[Deco Band]]  || [[lever filler|lever]]  || 22,82 ± 0,01 g ||  ±  g ||  ±  g ||  ± ml
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{{CategorizeArticle|Principianti}}
 
{{CategorizeArticle|Principianti}}
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