KNF-101 series PH sensor for glass electrode method pH water quality detection sensor, mainly used in tap water, pure water, swimming pool, sewage discharge, surface water, aquaculture, industrial production, isolation power supply design, data stability, strong anti-interference ability, PH support automatic temperature compensation/manual temperature compensation (automatic temperature detection, probe disconnect/failure, switch to manual temperature compensation), support USA/NIST/ custom PH standard solution!