What Is Standard Magnification For Grading?

If I remember right,PCGS uses a 5x and then a 10x.
John1

Just remember to have your eye's open when grading so your not like
Brian.

I read an article about PCGS procedures where the writer said he used mostly 5x magnification but sometimes took another look with 8x. Also said he sometimes used 10-14x for authentication and varity issues.

Remember, at higher magnification, you are seeing the trees not the forest. You can use higher magnification if you need too, but you will have to train yourself to recognize how the picture you are seeing relates to current grading standards. You have to remember that some of the issues you are seeing are actually no issue at all at lower magnification. For example, on an MS-63 coin, bag marks and hairlines might look depressingly large when viewed under 20x magnification but be relatively minor and in accordance with the grade when viewed in hand or under low magnification.

Personally I use 5x or 10x, depending on the size of the coin (with 20x thrown in for the odd issue) because my eyes aren't what they used to be either.

I use a 4x6x10x loupe. Generally I use the 6x for grading.