Bluelab pH PenPlus Replaceable Probe - Digital pH & Temperature Meter for Hydroponics, Water Testing & Grow Systems

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Bluelab pH PenPlus Replaceable Probe - Digital pH & Temperature Meter for Hydroponics, Water Testing & Grow Systems

Name: Bluelab pH PenPlus Replaceable Probe - Digital pH & Temperature Meter for Hydroponics, Water Testing & Grow Systems
Brand: Bluelab
SKU: BPHPP13
Price: 186.0 AUD
Availability: InStock
Rating: 5.0 (1 reviews)

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Bluelab

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The Bluelab pH PenPlus is a compact digital pH and temperature meter designed for growers who need dependable readings in hydroponics, fertigation, nutrient solution mixing, reservoirs, irrigation systems, and demanding cultivation environments.

Built with a replaceable pH/temperature probe, this handheld meter helps extend product life by allowing the probe to be swapped when natural probe wear occurs, rather than replacing the entire pen. Its double-junction probe supports reliable measurement performance, while the IP68 dustproof and waterproof design makes it suitable for everyday grow-room, greenhouse, and field use. With a bright backlit display, hold-reading function, simple 2-point calibration, 30-day calibration reminder, and temperature display in °C or °F, the Bluelab pH PenPlus gives growers a practical, long-term tool for maintaining pH confidence in every reading.

Features

Replaceable pH/temperature probe helps extend the life of the meter
Double-junction pH probe supports reliable pH measurement
Screw-cap probe design allows quick probe replacement
Measures pH and temperature in solution
pH range: 0.0–14.0 with 0.1 resolution
pH accuracy: ±0.1 at 25°C / 77°F
Temperature range: 0–50°C / 32–122°F
Temperature accuracy: ±1°C / ±2°F
Bright backlit display for easy reading in work areas
Hold-reading function helps capture results before recording
Simple 2-point calibration with 30-day reminder
KCl-filled silicone cap with internal sponge helps maintain probe hydration
Integrated lanyard with waterproof silicone probe cap
Auto-off function helps conserve battery life
IP68 dustproof and waterproof rating
Compact handheld design for grow rooms, reservoirs, irrigation systems, and water testing
Powered by 1x AAA alkaline battery

How to Use

Remove the protective silicone cap and check that the probe is hydrated before use. Rinse the probe with clean water, then place the probe tip into the nutrient solution or water sample being tested. Wait for the reading to stabilise, then use the hold function if you need to capture the result before removing the pen. Rinse the probe after testing, apply the storage cap with the KCl-filled sponge as directed, and store the meter within the recommended temperature range. For best accuracy, perform a 2-point calibration regularly and follow the 30-day calibration reminder. Replace the probe when natural wear affects performance.

Click here to view the Bluelab pH PenPlus User Manual

Why You Should Buy

The Bluelab pH PenPlus is built for growers who want dependable pH monitoring without unnecessary downtime. Its replaceable probe design makes it a smart long-term choice, helping restore meter performance when the probe naturally wears instead of replacing the full device. The waterproof, dustproof IP68 construction, backlit display, compact body, calibration reminder, and temperature reading capability make it a practical tool for daily nutrient solution management, hydroponic growing, greenhouse work, reservoirs, and irrigation testing. For growers who rely on consistent pH data to support nutrient uptake and crop health, the pH PenPlus offers convenience, durability, and confidence in a professional handheld format.

Lifestyle & Use Cases

Ideal for hydroponic growers, greenhouse operators, irrigation system users, commercial cultivation teams, and home growers who need quick, repeatable pH and temperature checks. Use it when mixing nutrients, checking reservoirs, testing runoff, monitoring irrigation water, or maintaining balanced growing conditions across different systems.

FAQs

Is the Bluelab pH PenPlus waterproof?

Yes. The pH PenPlus is built to IP68 standards, meaning it is designed to be dustproof and waterproof.

Can the probe be replaced?

Yes. The pH PenPlus includes a replaceable pH/temperature probe with a screw-cap design, allowing the probe to be swapped when natural wear occurs.

Does it show temperature in both Celsius and Fahrenheit?

Yes. Temperature can be displayed in °C or °F.

How often should it be calibrated?

The meter includes a simple 2-point calibration process and a 30-day calibration reminder to support accurate readings.

How should the probe be stored?

Store the probe hydrated using the KCl-filled silicone cap with internal sponge, following the product care instructions.

What environments is it best suited for?

It is well suited for hydroponics, nutrient solution testing, reservoirs, irrigation systems, greenhouse use, and water testing in grow environments.

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Frequently Asked Questions (FAQ)

Click to read our FAQs & learn more!

What does the Bluelab pH PenPlus do?

The Bluelab pH PenPlus is a handheld meter that measures both pH and temperature in nutrient solutions, reservoirs, irrigation water, and plain water. It helps growers monitor solution conditions accurately so nutrients remain available to plants and feeding programs stay consistent.

What makes the Bluelab pH PenPlus different from a standard pH pen?

Its biggest advantage is the replaceable pH and temperature probe. Instead of replacing the entire meter when the probe eventually wears out, you can simply install a new Bluelab pH ProbePlus, extending the life of the meter while reducing long-term ownership costs.

Can the Bluelab pH PenPlus be used for hydroponics, soil, and irrigation water?

Yes. The pH PenPlus is suitable for hydroponic nutrient solutions, reservoirs, irrigation systems, fertigation, greenhouse applications, and testing plain water. It measures the solution itself, making it useful across virtually any growing method where accurate pH management is important.

How accurate is the Bluelab pH PenPlus?

The meter measures across a 0.0–14.0 pH range with a stated accuracy of ±0.1 pH at 25°C. It also measures temperatures from 0–50°C (32–122°F) and allows readings to be displayed in either Celsius or Fahrenheit.

Is the Bluelab pH PenPlus waterproof?

Yes. The meter carries an IP68 waterproof and dustproof rating, making it well suited to wet grow-room environments. It also includes a backlit display, hold-reading function, and automatic shut-off, making it practical for routine testing in low-light or humid conditions.

How do I calibrate the Bluelab pH PenPlus?

The meter uses a simple two-point calibration process, typically with fresh pH 7.0 and pH 4.0 solutions. A 30-day calibration reminder helps maintain accuracy, although recalibration should also be performed whenever readings become questionable or after cleaning and maintenance.

How should I store and care for the Bluelab pH PenPlus probe?

The probe should always remain hydrated using KCl storage solution. Never store it dry, as this can permanently damage the sensor and reduce accuracy. Rinse the probe after each use, clean it regularly, and keep the storage cap fitted whenever the meter is not in use.

When should I replace the Bluelab pH PenPlus probe?

If cleaning, proper hydration, and recalibration no longer restore stable readings, the probe has likely reached the end of its service life. The replaceable Bluelab pH ProbePlus can be installed without tools, allowing you to restore performance without replacing the entire meter.

What comes in the box with the Bluelab pH PenPlus?

The kit includes the pH PenPlus with the replaceable probe already installed, single-use pH 7.0 and pH 4.0 calibration solutions, and KCl storage solution for proper probe care. These essentials allow you to calibrate, hydrate, and begin using the meter straight away.

Why is measuring pH so important for plant growth?

Even the best nutrient solution can become less effective if the pH falls outside the ideal range. Accurate pH monitoring helps reduce the risk of nutrient lockout, supports consistent nutrient availability, and allows plants to make better use of the fertiliser you're already providing.

Is the Bluelab pH PenPlus worth buying?

If you test nutrient solutions regularly, the replaceable-probe design makes the pH PenPlus a strong long-term investment. Combined with waterproof construction, reliable accuracy, straightforward calibration, and simple maintenance, it offers a practical upgrade over disposable-style pH pens.

What warranty does the Bluelab pH PenPlus include?

The Bluelab pH PenPlus is backed by a 2-year limited warranty, while the replaceable Bluelab pH ProbePlus carries a separate 6-month warranty. This reflects the fact that probes are consumable components that naturally wear with regular use.

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hey guys,
i get a lot of stuff from fb and others! that promis this and that, money back if it dosent do as it says it can do !! haha, most of them are in the rubbish bin! cant be bothered to go thru the return bull shite! so, i was doubtfull your product would be any different! i use on my plants, a mixture of composted medium, with regular doses of liquid seaweed,magnesium, banana water, and were doing ok! so after using rootroids, my geraniunms, and suculants, have definatly look healthier, fuller, with little to no leaf dieback! nd have just started to flower! havent repotted any yet to see if the roots are better, but the plants tell me they are! so! this is one product i will be using again !!

Thanks Rex! Love hearing you gave Root Roids a chance. Stoked it's won you over! Healthier, fuller plants with less leaf dieback and flowers kicking off is exactly what we love to hear. Hopefully when you do your next repot you'll find the roots are just as impressive. Really appreciate the awesome feedback legend! 🙌

No.1 for Gnats

This product is well advised by horticulturalists for treatment of gnats. Used with another form of treatment it DOES decrease activity substantially. Tried and true.

Thanks legend! Love hearing the T-Drops are helping knock those gnats back. They really shine as part of a solid treatment plan, so it’s awesome to hear you’re seeing great results. Appreciate the tried-and-true feedback! 🙌

Effective

Worked very well after 3 spaced out applications spider mites are completely gone!

Thanks Billie! Love hearing the Kill-A-Mite did the job! Nothing better than seeing those spider mites gone for good. Really appreciate the feedback and thanks for your support! 🙌

Better than expected

I used root roids powder feed, the transplant granules for 1 repot and some basillicus granules.

Have had an incredible root and growth rate. Unlike any combo ive found previously.

Amazing work. Great care has gone into developing these products.

Thanks Scott! Love hearing you've been putting the full lineup to work 🙌 Stoked the combination has delivered such impressive root development and growth. Hearing it's outperforming anything you've used before is huge for us. Really appreciate the kind words and recognition of the work that's gone into developing these products legend! 💪

Only just tried it to early to tell

Thanks Joe! Fair call mate, still early days! Hopefully the Root Roids Granular gets to work and starts showing its magic soon. We appreciate you giving it a go and look forward to hearing how it performs down the track 🙌.

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