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How to use and calibrate the Hanna Instruments HI 8424 Portable pH/ORP Meter. This easy to use, versatile pH/ORP meter can be used for water quality, hydroponics, agriculture, water treatment,plating and more. This meter includes Automatic Temperature Compensation, Auto Shut-Off and a HOLD feature for storing readings. For more information, visit http://goo.gl/mtyg4