Part Number: 0056900

Use this reference solution to properly care for pH sensors (standalone or combination pH/ORP) installed on:

  • TROLL 9500 Multiparameter Sondes
  • smarTROLL Multiparameter Handhelds
  • Aqua TROLL 400 Instruments

It’s time to replace your reference junctions when the sensor fails to calibrate with a reasonable slope and offset, even after replacing the filling solution. Acceptable slope and offset ranges vary by instrument, so please refer to your instrument manual.



  • 60-mL bottle of reference filling solution


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