Secchi Disk, Two Face Type

The Secchi Disk is a visibility disk that is black and whitequadrants on one side and white on the reverse side, used for natural waterquality studies. Made of acrylic plastic, standard size 200 mm x 13 mm withstainless steel weight 500 g. and 10 m. un-calibrated or calibrated line (markerresolution 1 m.) with locking snap ring end.