General Hydroponics PH 4.01 Calibration Solution for Gardening, 8-Ounce
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<b>[Product Information]</b><br>
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<li>General Hydroponics uses the highest quality electronic meter reference solutions</li>
<li>Growers can use our reference solutions widely among many popular brands of meters using the NaCl scale</li>
<li>General Hydroponics technicians check each batch to ensure that our solutions are exactly calibrated each time they are used</li>
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