This template is missing radar systems, used by Cassini, several Venus missions and several other related missions. They would need to be added at the top for alphabetical reasons.
Even though Mariners 4 and 5 used a helium magnetometer, it was a triaxial and not a helium vapor.
The Cassini-Huygens magnetometer is both a triaxial (vector) and helium (general field).
IRIS (Infrared Interferometer Spectrometer and Radiometer) is both a radiometer and IR spectrometer.
SPICAM, SPICAV and MASCS (MESSENGER Atmosphere and Spectometer Surface Composition) are both a visible-IR and UV-visible spectrometer. SPICAV has a special infrared version of a radio science (radio occultation) spectrometer that is designed to detect the interference of Venus's atmosphere as that satellite passes behind Venus relative to the Sun.
ASPERA (Analyzer of Space Plasmas and Energetic Atoms) -3 and 4 are a Neutral Particle Imager (NPI), Neutral Particle Detector (NPD), Electron Spectrometer (ELS), and Ion Mass Analyzer (IMA)
SPS (Solar Plasma Spectrometer) is both a neutral particle and ion detector.
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