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 445500 Rod Held Current Meter RHCM 270 Price on request 445515 Rod Held Current Meter RHCM Price on request 439015 Analog Channel incl. calibration for AMT oxygen an Price on request