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Description
pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7.0 first (buffer) then to pH 4.0 (slope). Calibration Solution should be stored in a cool place out of direct sun and heat. They should be stored with the lids securely tightened.””
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![Alchemist H2O2 Liquid Oxygen 34% Quart (24 each) SPECIAL ORDER [Minimum Order Quantity 10] (Not for sale in CT DE IA ID IL MD MN ND NE NJ NM OR PR SD TN VA WI WV WY) 704553](https://i0.wp.com/www.horticulturesource.com/fresh/wp-content/uploads/2019/07/HGC704553-01.jpg?fit=324%2C324&ssl=1 "Alchemist H2O2 Liquid Oxygen 34% Quart (24 each) SPECIAL ORDER [Minimum Order Quantity 10] (Not for sale in CT DE IA ID IL MD MN ND NE NJ NM OR PR SD TN VA WI WV WY) 704553")
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