APCI Capillary Electrode, API 4000, API 5000, 4500 Back Catalog number: CTS-21102 Availability: In the manufacturer's stock Price on request - + Recommended MW804 pH/EC/TDS/Temp tester MW804 Price on request HI9126 Přenosný pH/ORP metr Hanna Instruments Price on request C65 Waterproof conductivity tester, 0 to 1999 μS/cm Price on request