Bluelab Combo Metre Plus pH/EC/temperature

Product detailed description

Bluelab Combo Metre Plus is a portable measuring set that monitors three key nutrient solution parameters with one device - pH, conductivity (EC), and temperature. It differs from the standard Combo Metre by its pH probe: instead of a classic glass probe for solution, it is equipped with a hardened Bluelab Leap pH Probe with a reinforced tip, allowing you to measure pH not only in solution but also directly in substrate, coco, or rockwool.

Why it is worthwhile

• Hardened Leap pH Probe with a pointed tip measures pH directly in the root zone - where a regular glass solution probe is insufficient.
• Three parameters in one - pH (0-14) with ±0.1 pH accuracy, conductivity in EC (0-9.9), CF (0-99), PPM 500 (0-4950) and 700 (0-6930), and temperature in degrees Celsius and Fahrenheit.
• Replaceable pH probe via BNC connector - when the Leap probe wears out, you replace only it, not the entire device.
• Conductivity and temperature probe factory calibrated - you only calibrate the pH probe easily with one button.
• Automatic shutdown after 4 minutes, two-metre-long cables, and a five-year warranty on the device (6 months on the Leap probe).

Calibration and probe care

Calibrate the pH probe two-point with pH 4.0 and pH 7.0 solutions (or pH 10.0 if you usually measure above 7.0). The conductivity probe does not require calibration; verify accuracy against the EC 2.77 standard. Store the Leap probe in KCl storage solution and do not let it dry out; spare Bluelab Leap pH Probe and care kit for pH/EC metres are available separately.

Which option to choose

Choose Combo Metre Plus with Leap probe when you measure pH not only in solution but also directly in substrate, coco, or rockwool. The standard Bluelab Combo Metre has a classic glass solution probe and is suitable for purely hydroponic work at the reservoir. The pocket 3-in-1 pen with Bluetooth is offered by Bluelab OnePen. If you want to measure only pH in substrate without EC, choose the Bluelab Multimedia pH Metre.

Why monitor both pH and EC? EC shows the strength of the nutrient solution, pH determines nutrient uptake. Controlling both keeps the solution in the ideal range and prevents overfertilisation and uptake blockage.

Specifications

• Measured parameters: pH, EC (conductivity), CF, ppm 500 (TDS), ppm 700, temperature
• pH range: 0.0 - 14.0 (resolution 0.1; accuracy ±0.1)
• EC range: 0 - 9.9 (resolution 0.1; accuracy ±0.1 at 25 °C)
• CF range: 0 - 99 (accuracy ±1)
• ppm 500 (TDS) range: 0 - 4950 (accuracy ±50)
• ppm 700 range: 0 - 6930 (accuracy ±70)
• Temperature: 0 - 50 °C (resolution 1°; accuracy ±1 °C)
• pH probe: Bluelab Leap pH Probe with reinforced tip for direct substrate measurement, replaceable, BNC connector
• Calibration: pH two-point (pH 4.0 + 7.0, or 10.0) with one button; conductivity and temperature factory calibrated, no calibration needed
• Power supply: 2x AAA alkaline batteries
• Automatic shutdown: after 4 minutes
• Water resistance: not waterproof (splash resistant)
• Probe cables: 2 m
• Warranty: 5 years on device (6 months on Leap probe)
• Package contents: metre with conductivity and temperature probes and Leap pH Probe

Frequently asked questions

How does Combo Metre Plus differ from the standard Combo Metre?

The main difference is the pH probe. Combo Metre Plus is equipped with the hardened Bluelab Leap pH Probe with reinforced tip, allowing pH measurement directly in substrate, coco, and rockwool. The standard Combo Metre has a classic glass probe mainly for nutrient solution. Measurement ranges and accuracy are the same for both models.

Do I need to calibrate both probes?

No. The conductivity and temperature probes are factory calibrated and measure immediately after switching on. You only calibrate the pH probe two-point with pH 4.0 and pH 7.0 solutions. Calibration is easy with one button following the enclosed instructions.

Is the pH probe replaceable?

Yes, the Leap pH probe connects via a BNC connector and is fully replaceable. When worn out, you fit a new Bluelab Leap pH Probe without buying the entire device. The Leap probe has a six-month warranty, and the device itself has five years.