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 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 450536 Oxygen Sensor OxyGuard Ocean D.O. Probe Price on request