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Generic-Chemistry Related Sensors (Gen-Chemistry) refers to non-specific instruments on a platform used for atmospheric chemistry measurements. These are typically in situ analyzers that measure chemical compounds such as trace gases, halocarbons, volatile organic compounds, nitrates, aerosols, and other chemical species. Measurements can include mixing ratios, composition, particle size, optical properties, and particle size distribution.

Photosynthetically Active Radiation (PAR) sensors are in situ optical devices used to study photosynthesis and plant physiology. They detect light between 400 and 700 nm and convert it into signals for PAR measurement. PAR sensors can be mounted on ground- or water-based platforms or be portable and handheld. They are primarily used in agriculture, such as monitoring crop growth and analyzing light distribution in plant canopies, but they are also employed to study phytoplankton and aquatic productivity.

Conductivity, Temperature, and Depth (CTD) sensors are in situ instruments that measure water depth, pressure, salinity, temperature, and density in the ocean. CTD sensors can be deployed on various water-based platforms, including autonomous underwater vehicles (AUVs), buoys, gliders, and research vessels. When mounted on a vessel, CTD sensors are typically attached to a rosette and lowered to the seafloor to record water properties. These sensors typically sample at 30 Hz and can provide accurate measurements at specific water depths, tailored to the researcher's needs.