# Measuring magnification

**URL:** <https://forum.kirupa.com/t/measuring-magnification/277015>\
**Category:** open source\
**Created:** [December 6, 2008, 6:57am UTC](https://forum.kirupa.com/t/measuring-magnification/277015 "2008-12-06T06:57:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![hellogreen](https://avatars.discourse-cdn.com/v4/letter/h/f6c823/32.png) [@hellogreen](https://forum.kirupa.com/u/hellogreen)\
**Post date:** [December 6, 2008, 6:57am UTC](https://forum.kirupa.com/t/measuring-magnification/277015/1 "2008-12-06T06:57:13Z")

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How to Measure magnification  
How can I see how strong a magnifying glass is?

I bought this magnifying glass [http://www.liangdianup.com/inventory/189901.htm](http://www.liangdianup.com/inventory/189901.htm) and I want  
to know how to test it to see how strong it is. I hear a lot of people talk about  
magnifying and how strong the magnification is, but I would like to know the true  
magnification of my magnifying glass. I have a few of them and some seem stronger then  
others. How can I rate these? How can I pin a correct number on mine? How do the companies  
that make these come up with these numbers.