Vintage Boiler Water Solidrometer Industrial Steam INC Oakland CA Thermometer

Description

Don’t know much about this other than it’s rare. I can’t find another one anywhere on the internet. It’s used as an excessory to a boiler, which means it’s pretty old. The instrument is I. Great shape. Very clear and clean glass.
Vintage Boiler Water Solidrometer Industrial Steam INC Oakland CA Thermometer. Condition is "Used". Shipped with USPS First Class.