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I want to buy an atmospheric filter for my espresso machine, but I don't know what part of the filter I should measure. Should I be measuring the radius from the internal part of the border of the filter or the external part of the ring/border?

Sorry, I tried to express myself as well as I could but I am not familiar with some coffee terminology in English.

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    Welcome! You could add a picture - that often helps when words don’t. – Stephie Feb 11 '20 at 19:05
  • @Stephie Ok. I will when I have more time and I'll add the machine's name as well. – Mister Equis Feb 11 '20 at 19:15
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    i've never heard of atmospheric filters for espresso machines - what's that supposed to do? – ths Feb 17 '20 at 10:01
  • @ths Maybe it isn't called that way in english. It's the same as non presurized filter. – Mister Equis Feb 18 '20 at 11:28
  • i think you might mean "non pressurized portafilter" or "basket". wokelark.com/wp-content/uploads/2019/11/… – ths Feb 18 '20 at 12:10
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The portafilter sizes are given as the inner diameter of the basket in mm. This is the same as the diameter a tight fitting tamper would have.

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