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Yes, each division on that ruler is 0.5mm, total widtch about 1cm. Where he says "Width of Sample Equals 1mm" it is wrong.

I only mention it because I've been trying to take some pictures through...

I just want to check something ... you guys do realise that his image size is one centimetre NOT one millimetre don't you?

He mislabelled it in at least one place:...