Electrolyte for Swansensor Sodium Reference, 100ml Filling solution for reference electrode, 100ml Specifications Refilling Solution KCl – 100ml Contact us to place an order. Downloads Downloads Click Here Related Products Reagent set for COPRA Silica-, for 6 month Reagent set Oxycon Online DPD, 8 sets Oxycon DES (Start, DPD 1a & 1b, GL, each 1x 45ml) pH-Calibration set (1x pH 7, 1x pH 9, each 40 ml)