General Hydroponics Ph 4.01 & Ph 7.0 Calibration Solution Kit, 8 oz
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<b>[Product Information]</b><br>
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<li>2 bottles - 1 each of Ph 4.01 & Ph 7.0 Calibration Solution</li>
<li>Highest quality electronic meter reference solutions</li>
<li>Each batch is checked to ensure calibration</li>
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