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 439015 Analog Channel incl. calibration for AMT oxygen an Price on request 438150 Plastic Net Bucket with snap-in bolt Price on request 439016 Pressure Sensor max. depth 3.000metres (or to be Price on request