"See? That was nothing. But that's how it always begins. Very small." - Egg Shen
When I want to confirm the low-end resolution of a flow cytometer, the size standards I use come from Spherotech, Specifically, catalog # NFPPS-52-4K on their page for Nano Fluorescent Size Standards.
Word of caution - scatter is a rough approximation of size and it isn't straightforward. Read up on Joanne Lannigan's papers as well as the relevant chapters in Howard Shapiro's Practical Flow Cytometry.
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