Blue Lab - Guardian Monitor

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  • Regular price £249.95
Tax included.

 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)



  • 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)


Technical Specifications

  pH Conductivity Temperature

Measurement range:

0.0 – 14.0 pH 0 – 5.0 EC,
0 – 50 CF,
0 – 2500 TDS (ECx500),
0 – 3500 ppm (ECx700)
0 – 50 °C,
32 - 122 °F
Resolution: 0.1 pH 0.1 EC,
1 CF,
10 TDS,
10 ppm
1 °C, 1 °F

Accuracy at 25 °C / 77 °F:

±0.1 pH ±0.1 EC,
±1 CF,
±50 TDS (ppm 500),
±70 ppm 700
±1 °C, ±2 °F
Calibration: Two point
(pH 7.0 and pH 4.0 or pH 10.0)
Not required
(factory calibrated)
Not required
(factory calibrated)
Automatic Temperature Compensation:

(if conductivity / temperature

probe is in the same solution as pH probe)

Yes Yes

Operating environment: 0 - 50°C, 32 - 122°F
Power source: Input: 100-240 Vac, 50-60 Hz, 5 VA, 4 interchangeable plug types (USA, Euro, UK, NZ/AUS) Output: 5VDC 1Amp
CE Certification Symbol    FCC Certification Symbol    WEEE Certification Symbol