See Photo - I have checked the accuracy and accuracy. I've used this several times and it's very useful. No more corners on paper. No more guesswork. It is very well made (stainless steel). The keys are a little small and completely black, a little hard to see. The only thing that irritates me is the sharpness of the edges. Maybe I need to tighten the skin on my fingers. It's not a problem when I'm wearing gloves, but then the buttons are almost impossible to use. Overall I'm very happy with it.
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