Helium 99.999% 500 psi/ 34 Liters/ 1.2 Cubic Feet/ CGA-600/ Steel/ Disposable/ Non-Reactive. Plus the control valve to fit this bottle. This Cal gas or calibration gas is used for calibration and maintenance of gas detectors. We produce calibration gases for a large variety of gas detectors. If you have a need for a calibration gas that is not shown in our e-commerce store, simply call for a quick quote.