Defining a Vernier Caliper when a reading is already showing....

[nineteen]

Hey, there was an MCQ question in our term test paper regarding measurements and it was about what the reading was of a vernier caliper. But the least count of it wasn't given. As it was already showing a reading, I was kinda confused on how to define it. Is there any method to define a vernier caliper when a reading is already showing?

By all means, this is not practical life, I am talking about a question that was given in a test I took recently. That's the reason I am seeking a way to define it.

 

[Charles Link]

The way a vernier caliper works is that each notch on the moving part is 9/10 of the distance of the stationary markings. That way, if the thing is a unit plus 1/10, the first one past the zero will line up, and if it is a unit plus 2/10, the second one on the moving part will line up. $\\$ The base doesn't need to be ten. It can be done with $\frac{1}{4}$'s, where each one is 3/4 of unit, or it can be done with $\frac{1}{25}$'s, where each one is 24/25 the marking on the stationary part.

 

[nineteen]

The way a vernier caliper works is that each notch on the moving part is 9/10 of the distance of the stationary markings. That way, if the thing is a unit plus 1/10, the first one past the zero will line up, and if it is a unit plus 2/10, the second one on the moving part will line up. $\\$ The base doesn't need to be ten. It can be done with $\frac{1}{4}$'s, where each one is 3/4 of unit, or it can be done with $\frac{1}{25}$'s, where each one is 24/25 the marking on the stationary part.

Yes, but I have a question, sir. Does this theory agree with extended vernier calipers?

 

[Charles Link]

Yes, but I have a question, sir. Does this theory agree with extended vernier calipers?

Yes. That's exactly how they work.
The two lines don't normally match up perfectly, but you pick the one that matches the closest to get the decimal place.

 

[nineteen]

Yes. That's exactly how they work.
The two lines don't normally match up perfectly, but you pick the one that matches the closest to get the decimal place.

Thank you very much, highly appreciated, sir.