Having spent way longer fkn with Secchi disks than I’d like to admit, I’m curious what/why you’re doing this? (I’m an ocean engineer by training and my wife is a marine biologist - so I have to ask. 
especially after I showed this to her).
Having spent way longer fkn with Secchi disks than I’d like to admit, I’m curious what/why you’re doing this? (I’m an ocean engineer by training and my wife is a marine biologist - so I have to ask. especially after I showed this to her).