... F-, NO3-, BF4-, CN-, Cu2+, Pb2+, Ca2+, etc. for easy use. User can match relevant ion selective electrode and reference electrode to ... automatic temperature compensation function.3.3. With calibration function which can make zero oxygen calibration, full scale calibration, atmosphere calibration ... Characteristic:4.1. Big 5.7?? touch screen for easy use.4.2. Apart from ion concentration, meter allows to ...