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HI721-21 Iron Standards for HI721 Hanna Checker - Fresh Water

SKU: 208624

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  • Quick Overview
Easily calibrate and test proper functionality of your Hanna Checker HI721 Iron HIgh Range for fresh water.
  • Contains Standard A, Standard B and 1 Packet 721-25 Reagent*
  • Follow instructions in packaging
  • Acceptable results must be between 0.94 and 1.06 ppm at 25°C