Magnesium (Mg+2)     Calcium (Mg+2) Model MG21502 Sensor Type Polymer Membrane Direct Measuring Range Molar - ppm(mg/L) 0.1 ~ 30,000 Slope mV/decade at 25¢ªC 25¡¾3 mV / between 10-100 ppm at 25¡ÆC pH Range 3 ~ 10 Temp(¢ªC) Range 0 ~ 40 (if calibrated at that temperature) Interfernce Cu+2,Ni+2,Zn+2, Fe +2 Pressure Range 0 ~ 30psi Response Time 95% response in 30 seconds Resistance 100 mega ohms Storage Long term, store dry Short term, store in dilute Magnesium standard