Commercially available devices: specifications and characteristics
| Eco Medics AG Exhalyzer D | Innovision Innocor | Ndd EasyOne Pro Lab | |
| Measurement principle | Ultrasonic transit in time | Photoacoustic spectroscopy | Ultrasonic transit in time |
| Overall design of set-up | Open circuit wash-in and washout design using bias flow | Closed, re-breathing circuit wash-in designed with CO2 scrubber to prevent CO2 accumulation Open circuit washout design | Open circuit washout design using bias flow |
| Inert gas assessed | N2 and SF6 MBW options available | SF6 | N2 |
| Bias flow gas mixture used | Medical air and 100% O2 required for N2-based MBW Wash-in SF6/O2/N2 mixture for SF6-based MBW sourced by individual user from local supplier | Wash-in gas available as licensed SF6 gas mixture supplied by Innovision | Medical air and 100% O2 required for N2-based MBW |
| Application | Adults, children and infants >3 kg | Anyone capable of following instructions from the operator | Adults and children aged >4 years and >18 kg |
| Additional comments | Semiportable Operator interface through linked laptop Phase III slope analysis for Scond and Sacin is integral to the software | Self-contained, portable User interface, LCD touch screen Phase III slope analysis not available | Self-contained, portable Operator interface, LCD touch screen Phase III slope analysis not routinely implemented; research software available |
SF6: sulphur hexafluoride; MBW: multibreath washout; Scond: usual index of ventilatory inhomogeneity in the conducting airways; Sacin: index of ventilatory inhomogeneity within the acinar airways.