APCI Capillary Electrode, API 4000, API 5000, 4500 Back Catalog number: CTS-21102 Availability: In the manufacturer's stock Price on request - + Recommended MW401 TDS meter MW401 Price on request TH310 Stick thermometer TH310 Price on request MW101 Portable pH meter, 0.00 to 14.00pH, 2point cal. Price on request