Name of this instrument? similar to vernier calliper

[jmher0403]

I used this instrument to measure the length of a slit.

It was similar to vernier calliper but it looks like a microscope and had movable small magnifying glass to determine the line that perfectly matches up with the measured value.

It measured to hundreth of a millimeter...

does anyone know what this is called?

It looked quite antique old fashioned looking, by the way.

 

[Hassan2]

micrometer screw gauge

 

[jmher0403]

um it looks like a microscope, not micrometer

 

[technician]

I think it is a "travelling microscope"
The small magnifier is for reading the vernier scale.

 

[jmher0403]

yep that's the one thank you so much ;)