The gas mixing apparatus at the COIFPM uses a high-precision balance integrated with micro-liter precise pumps to mix high pressure and temperature gases. Mixtures obtained from an external supplier can often take months to prepare and can cost thousands of dollars. The current gas mixing capabilities allows proprietary mixtures of gases and condensates to be mixed in-house to a high level of accuracy, in less time, and for a fraction of the cost. The system can accommodate pressures of up to 10,000 psi for both liquids and gases.