Visibility Disc acc. to Secchi, 3m steel rope, ma Back Catalog number: 443591 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 438150 Plastic Net Bucket with snap-in bolt Price on request 445500 Rod Held Current Meter RHCM 270 Price on request 438115 Mechanical Flow Meter with back-run stop Price on request