Visibility Disc acc. to Secchi, 3m steel rope, ma Back Catalog number: 443590 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 439016 Pressure Sensor max. depth 3.000metres (or to be Price on request 445515 Rod Held Current Meter RHCM Price on request 439013 Conductivity Sensor type SST, max. depth 6.000met Price on request