APCI Capillary Electrode, API 4000, API 5000, 4500 Back Catalog number: CTS-21102 Availability: In the manufacturer's stock Price on request - + Recommended MW803 pH/EC/TDS/Temp tester MW803 Price on request EC59 EC/TDS/Temp waterproof tester EC59 Price on request MW801 Smart pH/EC/TDS combined meter MW801 Price on request