How often should I calibrate Bluelab Guardian Monitor WiFi?

pH meters should be calibrated before every use or at minimum every 2–3 days during active grows. EC meters are more stable but should be verified against a known reference solution weekly. Bluelab Guardian Monitor WiFi uses two-point calibration for pH (4.0 and 7.0 buffer solutions) and single-point calibration for EC (2.77 mS/cm standard). Regular calibration is the single most important factor in measurement accuracy.

How do I store Bluelab Guardian Monitor WiFi properly?

Always store pH probes wet — never allow the probe tip to dry out as this permanently damages the glass membrane. Use the probe storage solution supplied with Bluelab Guardian Monitor WiFi or Bluelab KCl storage solution. EC probes are more robust but should also be rinsed with clean water after each use. Store Bluelab Guardian Monitor WiFi at room temperature away from direct sunlight.

What should I do if Bluelab Guardian Monitor WiFi is reading incorrectly?

First, recalibrate using fresh buffer solutions — old or contaminated calibration fluid is the most common cause of inaccurate readings. Rinse the probe thoroughly with deionised or distilled water between calibrations. If readings are still inconsistent after recalibration, check the probe for physical damage or contamination. Most probes have a service life of 12–18 months with proper care.

Is Bluelab Guardian Monitor WiFi waterproof?

Check the IP rating listed in the product specifications. Most handheld meters are splash-proof but not designed for submersion. Take care when measuring in deep reservoirs to avoid dropping the unit. Bluelab Guardian Monitor WiFi is designed for hydroponic nutrient solution testing — it is not rated for outdoor or continuous immersion use.

Does Bluelab Guardian Monitor WiFi ship fast within Australia?

Yes — Bluelab Guardian Monitor WiFi ships from our Australian warehouse with fast tracked delivery Australia-wide. Most east coast orders arrive within 2–5 business days. WA, NT, and TAS orders typically arrive within 5–12 business days.

Bluelab Guardian Monitor WiFi | pH EC Temperature Monitor Hydroponics Australia

$524.95

Bluelab Guardian Monitor WiFi | pH EC Temperature Monitor Hydroponics Australia

$524.95

Quick Answer

✓Free shipping on this item to VIC, NSW, ACT, SA and QLD. Ships from Melbourne.
Continuous pH, EC and temperature monitoring, with high and low alarm thresholds on every parameter.
WiFi alerts to your phone through the Edenic app, so a drift at 2am doesn't wait until morning.
Best suited to setups where a reservoir problem would cost you a crop, rather than spot-checking with a handheld.

Bluelab Guardian Monitor WiFi, Continuous pH, EC & Temperature Monitoring

The Guardian Monitor sits on the wall with its probes in the reservoir and reads pH, EC and temperature without you doing anything. That's the difference between it and every handheld meter on this page. A handheld tells you what the tank was doing when you last walked past it. The Guardian tells you what it's doing now, and tells you the moment it stops being right.

Built-in WiFi connects it to the Edenic app, so you get live readings, push alerts and logged history from wherever you are. Set high and low thresholds on all three parameters and the alarm does the watching.

Non-volatile memory holds your settings through a power cut, so it comes back configured rather than needing setting up again.

Key Benefits

Continuous monitoring. Live pH, EC and temperature from the reservoir, updated without manual testing.
WiFi alerts through Edenic. Push notifications the moment a reading crosses your threshold, plus live readings and history from any location.
High and low alarms on all three parameters. Set the range you want held and get told when it isn't, rather than finding out from the plants a week later.
Non-volatile memory. Settings survive a power outage, so monitoring resumes without reconfiguration.
Replaceable pH probe. Standard BNC connection, so the probe is a consumable and the monitor isn't.
Plant-safe display with adjustable brightness. Readable in the room without adding light your plants will respond to.
WiFi can be turned off. If you'd rather not put the unit on a network, it runs as a standalone monitor.

How It Works

Probes go into the reservoir. The pH and conductivity probes sit permanently in solution on 2 metre cables while the monitor mounts outside the tank.
It reads continuously. All three parameters sampled and updated in real time with no input from you.
Readings show on the display. Current values at a glance on the adjustable-brightness screen.
WiFi streams to Edenic. Live data to the app for remote viewing, logging and trend history.
Alarms fire on threshold breach. Push notification as soon as pH, EC or temperature moves outside the limits you set.

What Continuous Monitoring Actually Catches

The problems a handheld misses are the ones that happen between readings. pH drift after a top-up. EC climbing overnight as plants drink water faster than nutrient. Reservoir temperature rising through a hot afternoon while nobody's in the room. That last one matters most in an Australian summer, because above 22 degrees dissolved oxygen starts dropping and above 26 Pythium can establish inside a day or two. Our guide on cooling a grow tent through summer covers what to do once the alarm goes off, and the root rot guide covers what happens if it doesn't.

System Features

Built-in WiFi. Remote monitoring through Edenic by Bluelab, disable-able if not wanted.
Configurable high and low alarms. Independent thresholds for pH, EC and temperature.
Continuous live readings. Uninterrupted output rather than spot measurements.
Replaceable pH probe. BNC connection for straightforward field replacement.
Adjustable display brightness. Keeps light spill down in a dark room.
Non-volatile memory. Settings retained through power interruption.
Interchangeable power plug. Suits different installation setups.
Mains powered. 110 to 240V, built for permanent installation rather than portable use.

Ideal For

Recirculating and DWC systems. Where the whole crop shares one reservoir, a single unnoticed drift affects everything at once.
Commercial operations. Continuous logging and remote alerts across a facility, rather than someone walking a meter around.
Growers who aren't on site daily. The alert is the product. If you're away for three days, this is what tells you something went wrong on day one.
Anyone who has already lost a crop to a reservoir problem. The cost of the monitor against the cost of finding out late is the whole argument.

Technical Specifications

Measurement Parameters. pH, conductivity (EC) and temperature, continuous and simultaneous
Connectivity. Built-in WiFi, Edenic by Bluelab app, can be disabled
Alarms. High and low thresholds on all three parameters
Power Supply. 110 to 240V AC mains
Display. LED with adjustable brightness
Probe Cables. 2 metres
pH Probe Connection. BNC, replaceable
Calibration. pH requires regular calibration. The conductivity and temperature probe is factory calibrated.
Memory. Non-volatile, retains settings after power loss
Warranty. 2 years
Shipping Weight. 2.5 kg
Shipping. Free to VIC, NSW, QLD, SA and ACT

The Bluelab Guardian Monitor WiFi is a continuous reservoir monitor for pH, EC and temperature, with phone alerts through Edenic for growers who need to know about a problem before their next visit.

Frequently Asked Questions

How often does the pH probe need calibrating?

Weekly during an active grow, using fresh pH 4.0 and 7.0 solutions. A continuously immersed probe drifts the same way a handheld one does, and because you stop checking manually once the monitor is in, a drifted probe on a monitor can mislead you for longer than one on a pen.

Does the EC probe need calibrating too?

No. The conductivity and temperature probe is calibrated at manufacture, so routine maintenance is pH only.

Can the probes stay in the reservoir permanently?

Yes, that's what they're designed for. The 2 metre cables keep the monitor itself outside the tank while the probes stay immersed. The monitor unit is not submersible and mounts on a wall or frame.

Do I have to connect it to WiFi?

No. WiFi can be disabled and the Guardian works as a standalone monitor with its display and alarms. You lose the phone alerts and the logged history, which for most buyers is the reason to choose this model over the non-WiFi Guardian.

How long does the pH probe last?

Typically 12 to 18 months with regular calibration. Continuous immersion is harder on a probe than intermittent use, so budget for replacement as a running cost. It uses a standard BNC fitting, so replacing it takes no tools.

What happens if the power goes out?

Settings and thresholds are held in non-volatile memory, so it resumes monitoring on the same configuration when power returns. It won't record what happened while it was off, so a power cut is itself worth knowing about.

Does it qualify for free shipping?

Yes. At $524.95 and 2.5kg it clears the $150 threshold and sits under the 3kg cap, so it ships free to VIC, NSW, QLD, SA and ACT. WA, NT and Tasmania pay the remote rate of $35.95, shown at checkout.