Refex - Model Series 399 1” NPT -pH Combination Electrode

Maintenance free REFEX Scries 399 electrodes arc designed for pH measurement in rugged applications. Series 399 combination electrodes feature the patented REFEX Contact Window, a non-porous, hard ionically conductive interface/bar her to prevent reference electrode electrolyte loss and poisoning. Typical application areas: Petro/Chemical. Pulp & Paper, Water Treatment, UPW.