How to Use Secchi Disk to Measure Visibility

[@candychoo691]

「あなたはビデオにもっと明るさを与えようとします、そうすればそれは素晴らしいでしょう」、

[@leajimvillanueva1215]

Hi. What happens when the disk is vissible until it reaches the lake floor? Is it the considered as the secchi depth?

[@光宏胡]

「明確なメッセージ、明確な構造、理解しやすい、ありがとう」、

[@KennyNatnat]

Hello, can i use secchi disk even if the water is just knee level?

[@leonbrette4438]

Some segments in the video are stamped not adjacent to each other