BlueLab Guardian PH/EC Monitor


4 in stock


4 in stock

BlueLab Guardian PH/EC Monitor

The Bluelab Guardian PH/EC Monitor is The simplest and most effective reservoir monitor you could ever own!

The Bluelab Guardian Monitor provides 24 hours continuous reading for pH, conductivity (EC/ppm 700/TDS/CF) and temperature within a nutrient solution.

Optimizing these critical parameters through a plants’ growing phase helps ensure a successful crop.

Designed for indoor use, the Guardian Monitor can be mounted on a wall or hung on a support bar. Set up your reservoir, place the pH and conductivity probes in the solution, then adjust and glance!

Simply set high and low alarm states – if the solution moves away from the ideal range, the display flashes. A quick look at the monitor will let you know when your nutrient solution needs adjusting.

  • Plant-safe 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 included
  • Replaceable double junction pH probe included
  • Adjustable display brightness
  • Non-volatile memory (setting retained when power lost)


Calibrating your Bluelab probes

Calibrate to ensure ongoing accuracy

You will need to calibrate your Bluelab monitor or controller’s pH probe to ensure its ongoing accuracy and to boost longevity. With Bluelab, this calibration process is quick and straightforward.  

Start by cleaning your pH probe and then calibrate it to two pH points using Bluelab pH buffer solutions (pH 4.0 and 7.0). Your monitor or controller’s on-screen information will guide you through the process. Once complete, the calibration symbol will appear on your screen.  

For conductivity and temperature, our probes are factory calibrated and will not need to be recalibrated. However, we do recommend that your clean your probes regularly. 

Monitor and controller maintenance

How to clean your pH and conductivity probes

For maximum efficiency and accuracy, you should clean your monitor and controller’s probes on a regular basis. All our products come with detailed and easy-to-follow care instructions. What’s more, you can purchase our probe care kits, which contain everything you need to clean and maintain your conductivity and pH probes.    

Our compact care kits contain probe cleaner, probe cleaning tools, calibration solutions, 2.77 EC conductivity standard solution and much more. Simply follow the step-by-step care guide that accompanies your digital controller or multi-parameter monitorRemember to calibrate your pH probe every time you clean it 

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