Honeywell Hygrothermograph 612X9-HT-00-00-7E16-L, Untested, Extra Charts, As Is

Description

Honeywell Hygrothermograph 612X9-HT-00-00-7E16-L, Untested, Extra Charts, As Is. Condition is "For parts or not working". Shipped with USPS Priority Mail.
Not sure if it is working. Comes with extra graphs. Some are used. There was a humming sound when plugged in. I’m also assuming nothing dramatic is supposed to happen when plugged in?? Not sure how it works.
Otherwise machine looks mint on the outside. Ink is considered bad if it uses ink???
Sold as is. No refunds. No warranty.