Bluelab pH PenPlus – Professional pH Meter with Replaceable Probe

Bluelab pH PenPlus is the latest generation of professional pH meter from Bluelab, created for growers who require maximum accuracy, reliability and a long instrument life. Its main innovation is the replaceable pH/temperature probe, which lets you replace only the probe when it wears out, without replacing the entire instrument. This reduces costs, minimises downtime and ensures consistently accurate measurements.

Bluelab pH PenPlus is developed specifically for professional use in hydroponics, coco substrates, soil growing, aquaponics and all systems where precise pH control is crucial. Thanks to its high-quality double-junction pH probe, the device delivers stable, fast and reliable measurements even with frequent use in nutrient solutions.

The greatest advantage of the PenPlus model is the replaceable pH probe (Bluelab pH ProbePlus). With standard pH meters, once the electrode wears out, the entire instrument has to be replaced. With PenPlus you only need to replace the probe through the practical screw mechanism, which significantly extends instrument life and reduces running costs.

The instrument measures both pH and temperature, has a bright backlit LCD display, a Hold function to retain readings, automatic shut-off to save battery power and a calibration reminder every 30 days. It is certified to IP68, meaning it is fully protected against dust and water and suitable for operation in demanding conditions.

Bluelab is one of the most recognisable manufacturers of measuring instruments for professional horticulture, and the PenPlus is designed and manufactured in New Zealand with a focus on long-term reliability and easy maintenance.

Technical specifications

✔️ Manufacturer: Bluelab

✔️ Model: pH PenPlus

✔️ Type: Portable pH and temperature meter

✔️ pH measurement range: 0.0 – 14.0 pH

✔️ Resolution: 0.1 pH

✔️ Accuracy: ±0.1 pH

✔️ Temperature range: 0 – 50°C

✔️ Temperature units: °C / °F

✔️ Automatic temperature compensation (ATC)

✔️ Double-junction pH probe

✔️ Replaceable pH/temperature probe

✔️ Backlit LCD display

✔️ Hold

✔️ Two-point calibration

✔️ Calibration reminder every 30 days

✔️ Automatic shut-off

✔️ Water- and dust-resistant housing IP68

✔️ Power supply: 1 × AAA alkaline battery

✔️ Compatible with Bluelab pH ProbePlus

📦 The kit includes

✔️ Bluelab pH PenPlus

✔️ Replaceable pH/temperature probe

✔️ Sachet of pH 7.0 calibration solution

✔️ Sachet of pH 4.0 calibration solution

✔️ Sachet of KCl storage solution

✔️ AAA battery

✔️ User manual

Benefits

✔️ Replaceable probe – you replace only the electrode, not the entire instrument

✔️ Exceptionally accurate and stable measurements

✔️ Measures pH and temperature simultaneously

✔️ Double-junction probe for longer service life

✔️ Waterproof and dustproof housing (IP68)

✔️ Easy two-point calibration

✔️ Reminder for the next calibration

✔️ Compact and convenient for daily work

✔️ Suitable for both professional growers and hobbyists

✔️ Reduces maintenance costs thanks to the replaceable probe

Application

Suitable for:

• Hydroponic systems

• Soil growing

• Coco substrates

• Aquaponics

• Greenhouses

• Measuring nutrient solutions

• pH control during irrigation

• Laboratory applications

• Aquariums

• Professional and hobby growing

📋 Instructions for use

1. Remove the protective cap and rinse the probe with clean water.
2. Immerse the probe in the solution to be measured.
3. Wait for the readings to stabilise.
4. If necessary, use the Hold function to retain the value.
5. After use, rinse the probe and store it with KCl solution in the protective cap.
6. Calibrate the instrument regularly with pH 7.0 and pH 4.0 buffer solutions for maximum accuracy.

💡 Tip from Urban Botaniks: To maximise the life of the pH probe, never store it in distilled water. Use specialised KCl Storage Solution and calibrate at least once a month or always after a prolonged period of non-use.