Horiba Reference Electrode Internal Filling Solution Item:300 - Reference Electrode Internal Solution for pH, 250 mL - 3200043640 Use the DO calibration solution

Use the DO calibration solution to calibrate Ultrapen PT5 / PTBT5 dissolved oxygen pens

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Horiba Reference Electrode Internal Filling Solution Item:300 - Reference Electrode Internal Solution for pH, 250 mL - 3200043640 Use the DO calibration solutionInternal filling solutions for refillable HORIBA reference and combination pH electrodes. These are the electrolyte that fills the reference chamber and completes the electrical circuit through the liquid junction without it at the correct level and concentration, the electrode cannot produce a stable reading regardless of how well the glass membrane is working. Refillable electrodes are topped up as part of routine maintenance. The level falls