I've read that checking the stylus for wear warrants a special stereo microscope.
However, for everyday (record to record) stylus inspection I use a 20X loop mounted on a stand. It is great for checking the stylus and cantilever for dirt. I position the loupe so it is the right height to check the stylus with the tonearm in its rest. So simple that I check after each side.
Got mine off ebay, below is a link. I have no affiliation with the product.
20X loupe on a stand
However, for everyday (record to record) stylus inspection I use a 20X loop mounted on a stand. It is great for checking the stylus and cantilever for dirt. I position the loupe so it is the right height to check the stylus with the tonearm in its rest. So simple that I check after each side.
Got mine off ebay, below is a link. I have no affiliation with the product.
20X loupe on a stand