This was once part of an engineer's toolkit, now its an old-school collectible.
Nothing plastic or electronic, a high quality surveyors instrument, sold by Frederick Goertz Ltd of Vancouver.
Also for sale, a Lufkin 200ft steel surveyors tape and reel, in used but fully functional condition, $20
and handy pocket stereoscope $25
For a high-performance stereoscope check out
https://vancouver.craigslist.org/rds/clt/d/surrey-vintage-fairchild-71-magnifying/7887020740.html