• 888-815-9763 Sales & Support Mon - Fri, 8am - 5pm PST. Instagram Facebook Twitter Google + Youtube



Save Now on Top Brands Like Twister, CenturionPro and Trimpro... Up To $600 off! Shop Now


Bluelab Guardian Monitor

Item #: 716336

Be the first to review this product

Your Price:

In Stock

In stock items ship within 24 hours
FREE Shipping!

100% Discreet Shipping Price Match Guarantee The HB Difference

Warranties | Returns & Replacements

Do you need a custom quote?

Call us today for a custom quote on your order.
Our product specialists are happy to help.

Request a Quote 888-815-9763

Bluelab Guardian Monitor

Additional Images


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.

  • 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)
  • 2 year limited guarantee for Bluelab Guardian Monitor
  • 6 month limited guarantee for Bluelab pH Probe


Brand Bluelab
SKU 716336
Weight (lb.) 2
Height (in.) 2
Length (in.) 10
Width (in.) 8.25
Warranty Yes
Free Shipping Yes

Bluelab Guardian Monitor Videos

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".

Shipping Info:

Free Shipping

Ships Via FedEx/UPS

Questions about this product?
Contact us for advice or more details. Our product specialists are here to help.
Email an Expert
Report an issue on this page

Why Shop with Hydrobuilder?
We offer the best service and support in the industry. Your complete satisfaction is our goal.