1 Mar 2022
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16 Feb 2022
The mini-Secchi disk is a simple hand-held, pocket-sized device, designed to measure water clarity (Secchi depth) and colour (FU scale)
19 Jan 2019
17 Dec 2018
The Secchi depth and the Forel-Ule colour have been recorded since the middle of the 19th Century in many lakes and oceans around the world.