Bluelab Guardian Monitor

The simplest and most effective reservoir monitor you could ever own!

The Bluelab Guardian Monitor provides 24 hour 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.

Bluelab 2 year guarantee   Bluelab 6 month guarantee   Wall mount
2 year limited guarantee for Bluelab Guardian Monitor
6 month limited guarantee for Bluelab pH Probe
(Proof of purchase is required)

Alternate Text Applications

Bluelab meters, monitors and controllers can be used in a wide range of industries, for home through to commercial applications.

Alternate Text Technical Specifications

Alternate Text How To Use

Read the full product manual and keep for easy reference, or watch a video now.

Select a language and download – our manuals are formatted for computer and mobile devices.
You can download Acrobat Reader if you need to.

More videos are available in our product video library.

Watch Videos

Watch our other Guardian Monitor videos:

Cleaning and calibration for probe care and maintenance tips. Setting the alarms shows the steps for ‘quick set’ or ‘manual set’ mode.

Alternate Text Top FAQs

Frequently asked Guardian Monitor questions:

Why do we need to clean the probes on Bluelab instruments?

A clean probe is an accurate probe!

Cleaning is the most important piece of maintenance required on any Bluelab instrument. The probe comes into contact with the solution and relay the reading back to the instrument for it to be displayed. The probe surface is susceptible to being contaminated or being covered in a greasy film that inhibits an exact reading. There are no shortcuts to cleaning the probes. It is already a very simple procedure and it will also ensure your instrument measures it right every time.

Watch any cleaning and calibration demo in our video library, or download a product manual to see how easy probe cleaning is.

Bluelab probe care kits contain instructions and all the tools you need to clean your probes.

My nutrient readings are inaccurate - why?

Possible Reason
  • The probe could be contaminated
  • The temperature of the solution could be very different to the temperature of the probe


Possible Solution

  • Clean the conductivity probe as described in the related article
  • Wait 5 - 10 minutes for the reading to stabilize

Why are my readings are noisy / readings jumping?

Possible Reason: Contact zone not immersed.

Possible Solution: Lower the pH Pen into the solution at least 2cm/1".
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