Accession Number: 2009.ph.1
A disk-shaped instrument with a glass top cover. Under the glass cover is a scale from 0 to 100 with a needle pointer. There are engravings which read “Airguide” and “Percent Relative Humidity”. It is mounted on a black plastic base with a hole to facilitate hanging.
Primary Materials: Glass, Metal, Plastic
“Made in U.S.A By Airguide Instruments Company Chicago”
Dimensions (cm): Height = 4, Diameter = 13.5
Function: To measure relative humidity.
Date of Manufacture: 20th Century