Finding the right shell size

[Fangs19]

I need help finding the right shell size but the thing is that both of my crabs are molting (M&M just went down yesterday and Hallow went a few weeks ago) and I don't have a ruler to measure them and I couldn't go out to get one either due to personal reasons they're both purple pinchers and I'm aware that they like turbos and round openings anyways how I can get the right shell size without being able to measure them and where should I buy the shells from?

[JoeHermits]

If you can’t measure you’ll have to guess-timate. It’s not a reliable method so you may have to buy a few different sizes that are close.

Some craft stores or seashell gift shops will have shells, otherwise online retailers like Naples Seashells or Richard’s Seashells are pretty reliable.


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[wodesorel]

Most crabs won't fuss about 1/8 to 1/4 inch jumps in size, so it never needs to be "perfect".