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The performance of calomel electrodes is now available without the hazardous mercury associated with the design. The "Calomel Free" design features an Ag/AgCl based double junction reference with a unique silver ion trap acting as a third junction to impede any silver ion contact with the sample. Reference output is adjusted to deliver the same output as a Calomel electrode using a silver chloride reference. As with all other Sensorex laboratory pH electrodes, the Calomel Free pH elecctrodes are supplied with a soaker storage bottle or soaker cap to make them instantly ready for use. Electrodes are interchangeable with almost every make and model meter on the market today. Select the proper cable connector and style of electrode for your meter.