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Bluelab Guardian Monitor

Bluelab Guardian Monitor

SKU #: HGC716336

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Bluelab Brand Product

Availability: Out of stock

Lead time: Due to social distancing requirements, this product ships in 7-10 Business Days


The Bluelab Guardian Monitor is by fast most simple, easy to use reservoir monitor you could invest in. Optimize your grow room and help your plants reach their full potential by dialing in important metrics such as pH & EC.

Optimize Your Grow With The Bluelab Guardian Monitor

Keeping your pH and EC dialed in is an essential component of any successful indoor grow. If your plants aren't getting exactly what they need, they won't reach their full genetic potential both in terms of size and potency. And, some nasty issues can arise, such as deficiencies or toxicities.

Luckily, this doesn't have to be a concern if you use the Bluelab Guardian Monitor. It can be mounted on a wall or hung by a support bar for easy monitoring. When you setup your reservoir, simply place the probes in the solution and adjust as needed. Gone are the days of constantly coming to the grow room and manually testing your nutrient solution!

Instead, you can set your high and low alarm states. If the Bluelab Guardian Monitor senses less than ideal conditions, it will start flashing. A quick glance at the monitor will let you know you need to adjust it.

Bluelab Guardian Monitor Features

  • 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)

Bluelab Guardian Monitor Applications











Bluelab Guardian Monitor Warranty

Warranty 6 month Warranty

2 year guarantee for Bluelab Guardian Monitor
6 month guarantee for Bluelab pH Probe
(proof of purchase is required)

Tech Specs


Weight (lb.)1.7
Height (in.)8.8
Prop 65No
Lead TimeDue to social distancing requirements, this product ships in 7-10 Business Days
Length (in.)3.7
Width (in.)5.3
Warranty2 Year
UL ListedNo

Bluelab Guardian Monitor Videos

Product Q&A

Bluelab Guardian Monitor Questions & Answers

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.

My nutrient readings are inaccurate - why?

Possible Reasons

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

Possible Solutions

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

  • Why are my readings noisy / readings jumping?

    Possible Reason

    • Contact zone not immersed.

    Possible Solution

    • Lower the pH Pen into the solution at least 2cm/1".