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The economical choice for a reliable pH electrode 6 month warranty by apera instruments Ph grade glass bulb. Sensor Equipped with a removable probe storage cap, keeping the sensor hydrated when not in use. Adopted KCL gel electrolyte, no need to recharge. 6 month warranty performed by Apera Instruments The economical choice for a reliable combination pH electrode ph grade glass bulb. Sensor adopted kcl gel electrolyte, no need to recharge.