Hach 1200-S PH & ORP Sensors. High quality pH electrode based on combined electrode technology. The perforated membrane combined with a polymerized solid electrolyte makes this electrode particularly insensitive to soiling and thus guarantees low user maintenance. Especially suited for soiled materials. Claros Enabled products share measurement data and status information with Claros – The Water Intelligence System from Hach. Claros provides greater confidence in your data, resulting in improved efficiencies in your plant’s operation. To ensure you achieve the full benefits of Claros, insist on Claros Enabled instruments.