HI 991001 Portable pH Meter
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Video Source: www.youtube.com/watch?v=87hxsUGR45M
How to use and calibrate the Hanna Instruments HI 991001 Portable pH Meter. This easy to use, versatile pH meter can be used for water quality, hydroponics, agriculture, water treatment,plating and more. For more information, visit http://goo.gl/0Ujow
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