Keuffel Esser Handheld Surveyor Tool X-RARE Ultra Fine Graduations Folding For Sale

Here is a super rare handheld surveyors tool decades ago I was explained how it works and for the life of me I have totally forgotten I was told then and know now that this is a super rare tool it is stamped with a K&E info and you can see it had been used for years the only distraction is that the strip mirror used for elevation graduations needs to be replaced a very economical piece I\'m sure this unit folds up for traveling please take a look at the pictures and ask any questions for any K&E collector this is a must have