<p>The portafilter sizes are given as the <em>inner diameter</em> of the basket in mm. This is the same as the diameter a tight fitting tamper would have.</p>

CC BY-SA 4.0
2020-02-18T12:15:44.803Z
2020-02-18T12:15:44.803Z
ths
<p>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?</p>

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

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2020-02-11T19:05:12.563Z
Welcome! You could add a _picture_ - that often helps when words don’t.
Stephie
CC BY-SA 4.0
2020-02-11T19:15:44.480Z
@Stephie Ok. I will when I have more time and I'll add the machine's name as well.
Mister Equis
CC BY-SA 4.0
2020-02-17T10:01:15.507Z
i've never heard of atmospheric filters for espresso machines - what's that supposed to do?
ths
CC BY-SA 4.0
2020-02-18T11:28:42.443Z
@ths Maybe it isn't called that way in english. It's the same as non presurized filter.
Mister Equis
CC BY-SA 4.0
2020-02-18T12:10:49.143Z
i think you might mean "non pressurized portafilter" or "basket". https://wokelark.com/wp-content/uploads/2019/11/dual_wall_and_single_wall_basket_top_and_bottom.png
ths
<espresso-machine><filter>
What measurement should I take to buy an atmospheric filter for my espresso machine?
Mister Equis
# What measurement should I take to buy an atmospheric filter for my espresso machine?

(Asked by: username_0 on 2020-02-11)

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.

**Tags:** espresso-machine, filter

> **Comments:**
> **username_1**: Welcome! You could add a _picture_ - that often helps when words don’t.  
> **username_0**: @username_1 Ok. I will when I have more time and I'll add the machine's name as well.  
> **username_2**: i've never heard of atmospheric filters for espresso machines - what's that supposed to do?  
> **username_0**: @username_2 Maybe it isn't called that way in english. It's the same as non presurized filter.  
> **username_2**: i think you might mean "non pressurized portafilter" or "basket". https://wokelark.com/wp-content/uploads/2019/11/dual_wall_and_single_wall_basket_top_and_bottom.png  

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## 1 answers

### Answer by username_2 on 2020-02-18. Score: 1

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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