Rod Held Current Meter RHCM Back Catalog number: 445515 Manufacturer: HYDRO-BIOS Availability: In the manufacturer's stock Price on request - + Recommended 450536 Oxygen Sensor OxyGuard Ocean D.O. Probe Price on request 438115 Mechanical Flow Meter with back-run stop Price on request 443590 Visibility Disc acc. to Secchi, 3m steel rope, ma Price on request