Bluelab Combo Meter Plus - Measures pH, Conductivity & Temperature

Bluelab Combo Meter Plus — Portable pH, EC & Temperature Meter with Leap Probe for Rootzone Testing

The Bluelab® Combo Meter Plus is an advanced all-in-one portable meter that measures pH, electrical conductivity (EC), and temperature — and goes further than the standard Combo Meter by including the Bluelab Leap pH Probe for direct rootzone pH measurement across a wide range of growing media. Whether you're testing nutrient solution in a reservoir or checking pH directly in soil, rockwool, coco coir, or potting mixes, the Combo Meter Plus gives you fast, accurate readings without the need for pH slurries or extraction mixes.

The Bluelab Leap pH Probe features a toughened spear-tip for improved durability and lightning-fast response in nutrient solution, making it equally effective for both liquid and solid media testing. The detachable probe design allows for easy replacement when the probe reaches the end of its service life. Battery-powered and lightweight, the Combo Meter Plus can be used anywhere in your facility with no external power supply required.

The easy-to-read backlit LCD screen is designed for low-light grow room environments, and simple push-button operation lets you cycle through parameters quickly. Features include two-point pH calibration with a 30-day calibration indicator, over/under-range indicators, a low battery indicator, and an auto-off function. Two AAA alkaline batteries are included.

Key Features

• Measures pH, EC (conductivity), and temperature in one portable device
• Includes Bluelab Leap pH Probe for direct rootzone testing in soil, rockwool, coco coir, and potting mixes
• Toughened spear-tip probe for improved durability and fast response
• Detachable, replaceable pH probe
• Backlit LCD display for low-light environments
• No external power supply required — runs on 2 AAA batteries (included)
• Two-point pH calibration with 30-day calibration indicator
• Over/under-range indicators, low battery indicator, auto-off function

Frequently Asked Questions

What makes the Bluelab Combo Meter Plus different from the standard Combo Meter?

The key difference is the included Bluelab Leap pH Probe. The standard Combo Meter uses a traditional pH probe designed for liquid nutrient solution testing. The Combo Meter Plus includes the Leap Probe, which features a toughened spear-tip that can be inserted directly into solid growing media — soil, rockwool, coco coir, potting mixes — for direct rootzone pH measurement. This eliminates the need for pH slurries or extraction mixes, saving time and providing more accurate, in-situ pH readings from the rootzone where it matters most.

Can the Bluelab Combo Meter Plus test pH in soil and coco coir?

Yes. The included Bluelab Leap pH Probe is specifically designed for direct insertion into a wide range of growing media, including soil, rockwool, coco coir, and potting mixes. The toughened spear-tip allows the probe to penetrate solid media without damage, delivering fast and accurate pH readings directly from the rootzone. This capability makes the Combo Meter Plus particularly valuable for growers using substrate-based growing systems where rootzone pH can differ significantly from reservoir pH.

Does the Bluelab Combo Meter Plus require calibration?

EC and temperature measurements are factory-calibrated and require no field calibration. pH calibration uses a simple two-point process with pH 7.0 (buffer) and pH 4.0 (slope) reference solutions. The 30-day calibration indicator reminds you when pH calibration is due. Bluelab recommends calibrating the pH probe at least once a week in active growing environments to maintain measurement accuracy, and more frequently if the probe is used in solid media.

Is the Leap pH Probe replaceable?

Yes. The Bluelab Leap pH Probe is detachable and replaceable. When the probe reaches the end of its service life — typically indicated by slow response times, drifting readings, or inability to calibrate accurately — it can be replaced with a new Bluelab Leap pH Probe without replacing the entire meter. This makes the Combo Meter Plus a cost-effective long-term investment for growers who regularly test both liquid and solid media.

Where can I buy the Bluelab Combo Meter Plus?

The Bluelab Combo Meter Plus is available through Seres Ag, a professional hydroponic and CEA equipment supplier serving growers across the United States. Purchase directly at seresag.com. Seres Ag offers expert product support, competitive wholesale and retail pricing, and US-wide shipping. For bulk or wholesale inquiries, contact the Seres Ag team through the website.