The OASIS moorings each comprise a suite of instruments: a thermistor chain to measure temperature with depth, a conductivity-temperature-depth sensor, a fluorometer to measure chlorophyll, a transmissometer for light transmission, meteorological instruments, a spectroradiometer, that measures light at different wavelengths, an
acoustic Doppler current profiler, a carbon-dioxide sensor, a PAR (photosynthetically active radiation) sensor, and such system diagnostic information as battery-power levels.