The mini secchi disc

The mini-Secchi disk is a simple hand-held, pocket-sized device, designed to measure water clarity (Secchi depth) and colour (FU scale) in lake, estuarine and turbid nearshore regions. It builds on the long tradition of using the Secchi disk and Forel-Ule scale, but is small, light and convenient-to-use, and modified for ease of operation in smaller water bodies, and from small watercraft and platforms. The device has use in scientific education, citizen science, satellite validation of ocean colour data, and low-cost monitoring of water clarity and colour.