# Vernier Scale

Kazza_765
During a physics prac today, we were using a traveling microscope with a vernier scale. My demonstrator told me I was reading the scale wrong, and as much as I tried to convince him otherwise he insisted he was right. Can anyone here tell me what the correct value to be read from the vernier scale pictured below is. The lower set of lines is a section of the centimetre scale, the top is the vernier scale. Assume that the '0' line on the vernier scale is just slightly to the right of the line highlighted in blue, and that the two lines marked in red line up perfectly. I read this as being 3.112cm but he said that was wrong and I could only be accurate to 0.01cm (even though he couldn't give me a correct reading).

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• Vernier.JPG
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looks like 31.25mm to me.

Kazza_765
I'm curious how you got 31.25mm. 31mm I understand, but I thought next you look for where the two scales line up and take the value from the top scale. So in this case we get 31mm + 0.12 mm = 31.12mm.

Ps. I realize that in this diagram the scales line up in several places, which is why I highlighted one of the lines in red, but it was the best I could do with powerpoint.