2 Pack Bundle: Hanna pH Calibration Solution 4.01 & 7.01 - 16 oz Each + Twin Canaries Chart & Pipette
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<b>[Product Information]</b><br>
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<li>Hanna's buffer solutions are made from established formulas and are standardized with a pH meter calibrated to NBS/NIST primary standard buffer solutions</li>
<li>Hanna pH 4 buffers contain potassium hydrogen phthalate</li>
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