Vintage Hydrometer, Radiator anti-freeze coolant tester. Interesting piece. The bobber is fully intact inside the glass tube. The black rubber bulb at the top is very stiff and does NOT squeeze. Called a FREEZ-D-TECTOR made by E. Edelmann Co. The oldest car listed on the front is from 1938. Interesting decor for a MAN CAVE.
Arlington but will to meet you in Everett on weekdays at around 4:30 pm
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