... 3.Backlit LCD 4.Four AA batteries Portable Ion Meter PXB-286 ModelSpecificationsPXSJ-226(Benchtop)PXSJ-216( ... Benchtop)PXB-286(Portable)ParameterspX /ion concentration /mV (ORP)/ °CRangepX0.000~14.0000.00 ... bit±0.3°C±1bitIon ModeSupport multiple common ion mode (such as H+,Ag+,Na+,K+,NH4 ... +,Cl-,F- etc…)Custom ion modepH/ pX /pF/ pClCalibrationUp to five,Custom ...