The Milwaukee MA924B/1 Refillable Combination ORP Electrode has a platinum ring design that this preferred for most ORP applications. The glass body is easily cleanable and gives fast results, making it ideal for wine applications. With a double junction reference, virtually no silver from the reference cell mixes with the sample. The ability to refill the electrolyte solution extends the life of the probe in which MA9011 3.5M KCl fill solution (sold separately) should be used for optimal results. With a refillable ORP electrode, best results are achieved if the fill cap is removed to create a higher flow rate. This results in a faster and more stable reading.