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In just one glance the Bluelab Guardian Monitor measures all three critical parameters pH, conductivity and temperature.

The Bluelab Guardian Monitor is a constant indicator of the desired levels of EC/ppm 700/TDS/CF, pH and temperature, The Bluelab Guardian Monitor provides 24 hour continuous reading for pH, conductivity (EC/ppm 700/TDS/CF) and temperature within a solution.

Optimising these critical parameters helps ensure your koi are kept perfect condition.

The Bluelab Guardian Monitor is mains-powered and is mounted to the wall or hung on a support and the probes simply placed into the pond water, filter.


With the Bluelab Guardian Monitor monitoring your water 24 hours a day and with the ability to set high and low alarms, a flashing display indicates if one parameter moves away from the ideal, allowing the required adjustments to be made, quickly and effectively.

Features of Bluelab Guardian Monitor

  • Green LEDs
  • Large easy to read displays
  • No calibration required for conductivity and temperature
  • Simple push button pH calibration
  • Selectable values for conductivity and temperature
  • Flashing high and low alarms
  • Greater tolerance to RF / electronic interference provided
  • Water resistant design
  • International power supply
  • Replaceable double junction pH probe
  • Adjustable display brightness
  • Non-volatile memory - setting retained when power lost.
  • 2 year guarantee for Bluelab Guardian Monitor
  • 6 month guarantee for Bluelab pH Probe