Bluelab Guardian Monitor

Sale price£320.00



The Bluelab Guardian Monitor measures pH, conductivity and temperature. It is a constant indicator of the desired levels of pH, EC/ppm 700/TDS/CF and temperature, enabling you to optimise these critical parameters through each growth stage. 

It has a large easy to read display. It is mains powered and can be mounted to the wall or hung on a support with the probes simply placed into the reservoir.

The Bluelab Guardian Monitor monitors 24 hours a day and has the ability to set high and low alarms, a flashing display lets you know when one parameter moves from the ideal, allowing you to make quick and effective adjustments.


  • Plant-safe green LEDs
  • For pH calibration simple push the button. No calibration is required for conductivity and temperature.
  • Selectable values for conductivity and temperature
  • Replaceable double junction pH probe
  • Adjustable display brightness
  • Water-resistant design
  • Non-volatile memory
  • 24/7 continuous monitoring of pH, EC and temperature in reservoirs
  • Large, backlit display for at-a-glance viewing with adjustable brightness
  • High and low alarms to alert you when parameters are out of range
  • Easy pH calibration function with on-screen instructions
  • 2-metre cable lengths for best positioning and viewing
  • Flexible mounting options for walls, posts and racks
  • Easy-to-clean display built for clean environments
  • 2-year warranty

Monitor your key parameters 24/7 


Save time and effort with the Bluelab Guardian Monitor
With the Bluelab Guardian Monitor, you will be able to continuously monitor the key parameters of pH, EC and temperature. There’s no need for manual measurements and spot checks; instead, you will only need to adjust for pH and nutrient.

When you consistently track the three fundamental parameters of nutrient uptake, you’ll be able to spot any fluctuations, allowing you to solve issues as and when they happen. After all, when you keep these parameters steady, you’ll end up with healthier plants.

Save time and labour with the Bluelab Guardian Monitor so that you can focus on growing great plants every single time.

Your key parameters – at a glance 

Bold, bright and always on 

The Bluelab Guardian Monitor’s large backlit LED display allows you to view your pH, EC and temperature at a glance.

You can also set discreet visual alarms for your preferred parameter ranges; these will let you know whenever your parameters are out of range. This ensures that you will always be on top of your reservoir conditions.

Made in New Zealand with growers in mind

All our products are built in New Zealand with growers, for growers – this means you can be confident that your water-resistant Bluelab Guardian Monitor can withstand the splashes that come with everyday growing.

How to maintain your Bluelab Guardian Monitor 

Stay connected to your parameters

While no calibration is required for conductivity and temperature, you will need to calibrate your monitor’s pH probe on a regular basis. Stock up on everything you need to clean, maintain and calibrate your probes by purchasing a Bluelab Probe Care Kit.

If you need to access your plant parameters remotely, why not consider upgrading to the Bluelab Guardian Monitor Connect?

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