Bluelab pH Probe Inline - 3/4in NPT - For Guardian Monitor Connect Inline

Inline Replacement pH Probe for Continuous Nutrient Line Monitoring

An inline monitoring system depends on its probe staying accurate through continuous immersion in flowing nutrient solution, and this Bluelab probe is built to replace a worn probe in the Guardian Monitor Connect Inline without disrupting the rest of the installed system. It threads directly into inline monitor bodies using a 3/4in NPT fitting, with a 1in adapter available for larger line fittings.

A 3-meter cable gives installation flexibility when the probe and monitor sit apart across equipment or piping, and the probe is fully waterproof for permanent inline duty.

Key Features & Benefits

• Double-junction probe design — reduces reference contamination for continuous-use inline applications.
• 3/4in NPT thread — installs directly into inline monitor bodies, with a 1in adapter for larger fittings.
• 3-meter cable — reaches monitoring setups where the probe and meter are separated by equipment.
• Fully waterproof — built for permanent immersion in flowing nutrient solution.
• Effective at 0.2 EC and above — accurate across common hydroponic nutrient concentrations.

Who Should Use This

Operators running a Bluelab Guardian Monitor Connect Inline who need to replace a worn pH probe without replacing the entire inline monitor are the direct fit for this part.

About Bluelab Corporation

Bluelab, a New Zealand company with more than three decades in measurement instruments, builds this inline probe as a factory-spec replacement for its Guardian Monitor Connect Inline system.

Frequently Asked Questions

Which monitor is this probe designed for?

This probe is designed for the Bluelab Guardian Monitor Connect Inline. It is not a fit for handheld Bluelab meters or pens.

What thread size does the probe use?

The probe has a 3/4in NPT thread and can be paired with a 1-inch adapter for larger inline fittings. Confirm your fitting size before ordering.

How long is the probe cable?

The cable measures 3 meters, giving reach for equipment installations where the probe and monitor housing are physically separated. This length suits most cabinet and wall-mounted monitor setups.

Why replace just the probe instead of the whole monitor?

Replacing only the probe is more cost-effective than replacing the full inline monitor. It also restores measurement accuracy without disrupting the rest of the installed system.