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Consistent image size


I’m wondering what the best approach is to ensuring that images (e.g., letter array) are the same (or approximately the same) size for all participants when running an experiment online. I.e., is it better to ask participants to only use a monitor with a certain resolution(s) and exclude anyone else? Get participants to change their resolution? Does setting units to height or norm lead to a better outcome? By same size I mean if you were to physically measure the size with a ruler it would be roughly the same for all participants. I’ve mostly used builder for the experiment, but happy to add more code if that provides a solution.

Thank you