Good quality and inexpensive Secchi Disk for water clarity measurements. Constructed of robust white plastic disk with permanent screen printed black sectors. Includes attached sinker and rot-proof polymer line on polymer foam bobbin. Line length is approximately 72 feet (22m) and includes a marking at each foot. The disk is 7.7" in diameter.
Shipping weight:  1.5 lbs.; Dimensions:  8.75" Diameter x 2" Height.