| AH | Absolute humidity |
| MFC | Mass-flow controller |
| MIR | Midinfrared |
| NDIR | Non-dispersive infrared |
| OPO | Optical parametric oscillator |
| PA | Photoacoustic |
| PAS | Photoacoustic spectroscopy |
| QEPAS | Quartz-enhanced photoacoustic spectroscopy |
| QTF | Quartz tuning fork |
| TDLAS | Tunable diode Laser absorption spectroscopy |
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