Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter

Easy to clean because of its bullet shaped glass bulb. Fully waterproof and less fragile than all-glass electrodes because of its tough polypropylene barrel. Gel filled (non-refillable) making it maintenance free and a double junction reference providing longer life!

Probe Tips

  • All probes are interchangeable between all Bluelab products
  • All probes carry a 6 month warranty
  • Proper hydration of pH probes is vital to maintain wick
  • All pH probes eventually need to be replaced—they can only house so much reference solution
  • KCl storage solution is required for optimum probe maintenance
  • RO water will reduce probe life