Looking for magnification suggestions

I need some sort of a magnifier. Mostly for mint marks. What do you guys use?

I have not searched much yet but am considering this 60x mobile phone attachment.

https://www.littletoncoin.com/shop/ProductDisplay?urlRequestType=Base&productId=249639&catalogId=29555&categoryId=56822&errorViewName=ProductDisplayErrorView&urlLangId=-1&langId=-1&top_category=10658&parent_category_rn=10658&storeId=10001