trifilter hydrophotometer

trifilter hydrophotometer

[′trī‚fil·tər ¦hī·drō·fə′täm·əd·ər]
(engineering)
An instrument that uses red, green, and blue filters to measure the transparency of the water at three wavelengths.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.