File:Premix Softdrink Carbonation Tester.JPG

This device is constructed of tempered glass and stainless steel with a quick connect on the bottom, and a 100 psi gauge and relief valve on the top. Used in the 1960s to check the pressure of premixed soft drinks before shipping them off in 5 gallon tanks by truck, it is operated by connecting the tank to the quick connect, bleeding off gas to allow the glass to fill and then shaking it up. The pressure is then read from the gauge.