Scripps Institution of Oceanography

SIO Reference 59-9. The Watar Clarity Meter  has as its purpose the measurement of those optxeal properties of natural ocean waters which will permit   the determination of the optical clarity of these waters in the visible' portion of the spectrum. It is essential that at least two properties be measured to allow the determination of the transmittance of optical signals through the water (i.e., the contrast transmittance). The properties which were selected m this instance are the attenuation coefficient for collimated light, and the attenuation coefficient for diffuse (ambient) light.