Instrument: Secchi Disc

Dataset: 
secchi depth
Instrument: 
Secchi Disc
Instrument Short Name: Secchi Disc
Community Standard Description
(http://vocab.nerc.ac.uk/collection/L22/current/TOOL0430/)
Instrument Description:

Typically, a 16 inch diameter white/black quadrant disc used to measure water optical clarity

PI supplied instrument name: Secchi Disc
Dataset-specific description

A 20 cm secchi disk with four alternating white and black quadrants was used.