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Transmissometers provide information about the optical properties of natural water by measuring the transmittance or attenuation of incident radiation. Sea-Bird Scientific offers transmissometers and an attenuation sensors for a variety of applications, including AUVs, deep ocean, and profiling floats.
ac-s Spectral Absorption and Attenuation Sensor

~80 wavelengths allows for deconvolution analysis

Beam Attenuation Meter (BAM) Transmissometer

Beam transmittance measurements for use on AUVs

c-Rover Transmissometer

Beam transmittance measurements for long-term deployments on profiling floats

C-Star Transmissometer

Sturdy, low cost sensor to measure beam transmittance