APCI Capillary Electrode, API 4000, API 5000, 4500 Back Catalog number: CTS-21102 Availability: In the manufacturer's stock Price on request - + Recommended C65 Waterproof conductivity tester, 0 to 1999 μS/cm Price on request MI5559 pH55 (pH/Temp waterproof tester Mi5559 Price on request MI106 Combined portable meter pH/ORP/Temp Mi106 Price on request