I was really hesitant to buy this based on all the feedback about the sizes not fitting. I think those reviews were probably correct. One person said that 5.25 was less than 5.00. And indeed they were right. 5.25 is slightly less than 5.00! That being said, I just needed something to put on my finger so I could measure with a ruler. And these are great for that. I definitely wouldn't trust the sizes of these things without measuring them and then going to a website that does a conversion between millimeters in diameter and actual ring sizes. Sizes between 10-12.5 seem to be pretty accurate. Also, the millimeter markings seemed right on the nose for the one I measured. (Although it is very difficult to notice a difference of a few tenths of a millimeter)! Some people have said these rings are very difficult to read, but I found them very clear. I had never worn a ring so I had no idea what size I was. They could have told me it was 4 or 14 and I wouldn't have noticed the difference. I just wanted to get a rough idea that when I order something online I only have to send it back once or twice, not 5-6 times. And for that they will work fine. But seriously, if you really need a perfectly accurate measurement, I wouldn't trust these things.
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