I ordered 4.0s, which are perfect for very close up work - I just wear 1, 2, or 3 pairs as applicable, which is usually more convenient than a headset.
They "stack" nicely, so that 4/8/12 is a matter of moving slightly. They also come with padded sleeves, which I use to separate them in their shipping box.Since they're decent quality, and the diopter is printed on the inside of the frames and does not rub off easily, I'm now ordering some in my normal, much weaker strength.
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