Environics’ gas mixing technology is based on very precise control of thermal mass flow controllers. Normally, thermal mass flow controllers offer an accuracy of +/- 1% of full-scale flow. However, when combined with Environics computerization and calibration, this accuracy specification is improved to +/- 1% of setpoint. Their calibrators and dilution systems exceed the accuracy required by the US EPA for Ambient Calibrators (ref: Method 205, 40CFR51, 40CFR60, 40CFR75).