The MC35-1000 is a single 35 ml chamber that is used in conjunction with an IPA-1000 Base Unit to form a complete test system. The IPA-1000 can run with one or two chambers. When running two chambers, they can be the same or a mix of a 35 ml and a 3.5 ml chamber. Chambers are automatically recognized by the Base Unit, so no special setup is required. Also, the calibration for each chamber is resident in the chamber and thus may be used with any IPA-1000 Base Unit.