Transparency board (Secki board) black and white 4-section 394328003 1 piece

The rope is marked every 50cm, making it easy to check the depth when descending the board. The transparency can be checked by lowering a plastic disk into the water and checking the depth at which it can no longer be seen from above. *The rope is not included with the transparency board. Size (mm): φ250 Specifications: Black and white, 4 divisions Material: Rope/nylon, weight/lead