Carl Mahr Thread gages

[luc]

Does anyone know this type of gage to measure screw thread?
There is an GO and a NOGO side
The 2 gages can not be removed
I have more than 100 pieces, all different sizes
Made by Carl Mahr

 

[johnoder]

Maybe MASTERS (setting) for this

MaraMeter 853 - Indicating thread snap gage - Mahr Metrology

 

[luc]

I think they are all metric
And i think that the flat ones are for internal measuring

 

[MichaelP]

If you find imperial flat ones from about 1" and up, please let me know.
Thanks.

 

[luc]

Probably masters for setting the micrometers