Bluelab Guardian Monitor

Bluelab Guardian Monitor — Continuous pH, EC & Temperature Display for Hydroponic Reservoirs

The Bluelab® Guardian Monitor is a wall-mounted continuous monitoring unit that provides constant, real-time display of three critical nutrient solution parameters: pH, electrical conductivity (EC), and temperature. Designed for hydroponic and controlled-environment agriculture (CEA) operations that need always-on visibility into reservoir conditions, the Guardian Monitor delivers reliable, accurate readings 24 hours a day without the need for manual testing.

The large, plant-safe green LED display is easy to read from a distance and features adjustable brightness to suit different grow room lighting conditions. Selectable values for conductivity and temperature allow you to display readings in your preferred units. pH calibration is performed via a simple push-button system, while conductivity and temperature are factory-calibrated and require no field calibration. Silent high and low alarms alert you when parameters drift outside your target range, and non-volatile memory retains all settings if power is lost. The water-resistant design is built for the humid conditions of professional grow environments. Backed by a 2-year Bluelab® Guarantee (6 months on probe).

Lead Time: This is a special-order item. Current estimated lead time of up to 35 days may apply.

Key Features

• Continuous display of pH, EC (conductivity), and temperature
• Large, plant-safe green LED display with adjustable brightness
• Selectable units for conductivity and temperature
• Simple push-button pH calibration; no calibration needed for EC or temperature
• Silent high and low alarms for all parameters
• Non-volatile memory — settings retained after power loss
• Water-resistant design for grow room environments
• International power supply included
• 2-year Bluelab® Guarantee (6 months on probe)
• Special order — estimated lead time up to 35 days

Frequently Asked Questions

What does the Bluelab Guardian Monitor measure and display?

The Bluelab Guardian Monitor continuously measures and displays pH, electrical conductivity (EC), and temperature of your hydroponic nutrient solution. All three parameters are shown simultaneously on the large green LED display, giving growers a constant, at-a-glance view of reservoir health without needing to manually test or check a handheld meter. This continuous monitoring capability is particularly valuable in commercial operations where reservoir conditions can change rapidly as plants feed and environmental conditions fluctuate.

Does the Bluelab Guardian Monitor log data or connect to a computer?

The standard Bluelab Guardian Monitor is a display-only unit — it shows real-time pH, EC, and temperature readings but does not include wireless connectivity or data logging. For operations that require data logging and remote cloud access, the Bluelab Guardian Connect or Guardian Monitor Connect In-Line models offer wireless connectivity via the Bluelab Connect ecosystem, enabling data logging to a computer and remote monitoring from any mobile device.

How do I calibrate the Bluelab Guardian Monitor?

pH calibration is performed directly on the unit using the simple push-button calibration system. Standard two-point calibration uses pH 7.0 (buffer) and pH 4.0 (slope) reference solutions. Conductivity and temperature are factory-calibrated and require no field calibration. Bluelab recommends calibrating the pH probe at least once a week in active growing environments. The probe carries a 6-month guarantee, and replacement probes are available separately.

What happens to the Guardian Monitor settings if power is lost?

The Bluelab Guardian Monitor uses non-volatile memory to retain all programmed settings — including alarm thresholds and display preferences — even if power is lost. When power is restored, the unit resumes monitoring immediately with all settings intact, requiring no manual reprogramming. This is an important reliability feature for commercial operations where power interruptions could otherwise disrupt monitoring continuity.

Where can I buy the Bluelab Guardian Monitor?

The Bluelab Guardian Monitor is available through Seres Ag, a professional hydroponic and CEA equipment supplier serving commercial growers across the United States. Purchase directly at seresag.com. Please note this is a special-order item with an estimated lead time of up to 35 days. For bulk or wholesale inquiries, contact the Seres Ag team through the website.