Oxygen Dissolved Applications Controllers Probe Models Applications Water Treatment Depuration Industry Swimming Pools 50 Series 42 Series S423 For the measurement of oxygen in wastewater, and of oxygen in primary, industrial, recirculating water. S423C OPT For the measurement of oxygen in wastewater, and of oxygen in primary, industrial, recirculating water. For a quotation request, technical information or a special application, please fill in the contact form. Information requestYour e-mail Your message Accept privacy policyPowered by ChronoForms - ChronoEngine.com.