How to do a pH calibration on an Orion Star A meter. Watch a pH calibration being performed on the Orion Star A211 pH meter. This procedure can be followed for the Star A211, Star A214, Star A215, Star A216, Star A221, Star A321, Star A324, Star A325, Star A326 and Star A329 meters. Learn how to optimize your pH calibration procedures! Learn more about pH measurement instrumentation and best practices at www.thermoscientific.com/water

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