The Horiba Laqua 9630-10D 3-in-1 pH Electrode, Low Conductivity Samples, Plastic Body, # 3200528726 is a plastic-body, refillable pH electrode with integrated temperature sensor is recommended for pH measurement of samples that have low conductivity or buffering capacity. Suitable for tap water and quality control check in water purification plant. Recommended to use with cleaning solution 230.