Manufactured in the early 1960s, this hygrometer is a useful tool in monitoring the humidity in your home.
It appears to have never been used and has been well taken care of.
It has not been tested, but the instructions will guide you on your way to using it and checking the humidity levels.
It is made by IDEAL SCHOOL SUPPLY COMPANY OAK LAWN ILLINOIS.
It is 10" long by 4" wide
It also comes with a small DELTA Celsius thermometer.
From a school teachers estate.
Please look at all pictures and ask any questions.