This unit is used for determining the `gas volumes` of a soda/soft drink. `gas volume` is a unit determined by the pressure inside a bottle and the temperature of the liquid. The gas volume tester is basically a quality-checking unit. One or two bottles are taken out from the production line at regular intervals and gas volumes checked. A thermometer is also required. It is however not supplied with the tester. The tester is first clamped on the bottle to be checked. Then the bottle is punctured with the spindle by rotating the knob and the pressure noted on the pressure gauge. The tester is then removed, bottle opened and the temperature of liquid checked. Both values are noted and the `gas volumes` found by referring chart provided. Soda and various soft drinks have varying `gas volumes` and the values have to be adhered to get the best quality.
