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 445515 Rod Held Current Meter RHCM Price on request 445500 Rod Held Current Meter RHCM 270 Price on request 438110 Mechanical Flow Meter Price on request