I found this which may be useful to someone:
The life cycle of a mealworm starts as a tiny egg that the human eye can barely see. Think of it being the size of a grain of sand. And to make visibility even worse, the egg is usually mixed in with dirt or whatever substrate or waste the egg...
I am setting up to breed mealworms and have bought a plastic drawer set. I now want to cut the bottom out of one drawer and fit mesh for the eggs to fall through. Having looked at fine mesh, I found a range of hole sizes and am wondering what size the eggs are so I can fit the best gauge mesh...