The Radiometer REF621 Reference Electrode has a glass body, mercurous sulfate (Hg/Hg2SO4) reference system, refillable electrolyte (sat. K2SO4), ground joint, and porous pin junction. The REF621 reference probe is recommended for chloride-free measurements. The REF621 is a screw cap electrode and requires an external connection cable for connection to a meter.
| What’s included? | Includes: Radiometer Analytical REF621 reference electrode with Certificate of Conformity. |

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