Secchi turbidity disk. Previously: Effluent sampler - GIF Pipeline inspection camera - GIF Man cleans out storm drain - GIF Diver emerges from sludge drying bed - GIF Venice septic tank cleanout boat - video
New plans added on 10/11: Click here for 2,505 plans for homemade tools.
nova_robotics (Mar 3, 2023)
UC Davis has been using those here for a long time...
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