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 438115 Mechanical Flow Meter with back-run stop Price on request 439016 Pressure Sensor max. depth 3.000metres (or to be Price on request 439013 Conductivity Sensor type SST, max. depth 6.000met Price on request