pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard
pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard

pH Calibration Solution by Bluelab - 4.0 & 7.0 Standard

BLUELAB-CAL-SOL-4-18ml

$2.95
/
Tax included. Shipping calculated at checkout.
Quantity
pH
Size
  • Handpicked by growers
  • Ships today
  • Real advice, real people
  • 6,596+ high-yielding customers
  • 30-day returns*
  • Free shipping over $499*
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  • Backordered, shipping soon

Pairs well with

🧪 Stay Accurate, Stay Ahead

If you want your Bluelab pH Pen or meter to give you accurate results time after time, you’ve got to show it a little TLC. That means regular cleaning and calibration - and these pH Calibration Solutions (4.0 & 7.0) are the exact tools for the job.

No guesswork, no drama - just a few minutes of maintenance for months of reliable readings. Whether you're dialling in feeds or troubleshooting lockout, calibration keeps your numbers (and your plants) bang on.

🔹 Key Features

⚗️ 4.0 and 7.0 pH reference standards

🔬 Compatible with all Bluelab pH pens and meters

💧 Essential for monthly calibration and cleaning

🧴 Available in 250ml or 500ml bottles

🛠️ How to Use It

After cleaning your pH probe, calibrate using 4.0 and 7.0 solutions as your reference points. Just follow the Bluelab instructions (same across all models). Calibrate monthly or whenever your meter tells you it's time - and always after cleaning.

🌟 Grow Guys Tips

Don’t wait for your readings to drift. Make calibration part of your regular grow routine. Keep your calibration solution bottles sealed tight and uncontaminated for best results.

🧪 Perfect For

Anyone using a Bluelab pH meter or pen - whether you're growing in coco, hydro, or soil. Accurate pH means efficient nutrient uptake, and this stuff keeps you locked in.

📦 Specs & Stuff

  • Types: 4.0 & 7.0 pH solutions

  • Sizes: 250ml, 500ml

  • Shelf-stable when sealed

  • Use for calibration after every clean

  • Compatible with all Bluelab pH products

🚀 Clean Probes, Clean Data, Clean Grows

Grab a bottle (or two) and keep your meters running like clockwork. Your plants will thank you - and so will your yield.

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Growers First, Retailers Second

Welcome to The Grow Guys

We built The Grow Guys from the soil up — well, coco and perlite. Before we sold gear, we bought it, ran it, and learned the hard way what's worth the money and what ends up in the shed. That's the filter everything on our shelves passes through. No sales scripts, no rebadged junk, no telling you what you want to hear. Just gear we'd run ourselves and advice from people who actually grow. Chasing higher yields, tighter flowers, or your first harvest? You're in the right place.

Meet The Grow Guys

FAQs

How fast do you ship?

Order by 2pm and it ships the same business day from Invermay, Tasmania.

How much is shipping?

Calculated at checkout by weight and destination. Free shipping over $499*.

Is the packaging discreet?

Plain packaging, no branding. No one knows what's in your box.

What's your returns policy?

30-day change-of-mind returns on unopened, unused products. A 10% restocking fee applies and return shipping is at your cost.

Can I get advice before buying?

Call, email, or walk into the Invermay shop. You'll get a grower on the other end, not a script.

Do you have a physical store?

Unit 10/110 Gleadow Street, Invermay 7248. Mon–Fri 8:30am–5:30pm, Sat 9am–3pm.

Inside The Grow Guys hydroponics store in Invermay, Tasmania

Still got a question?

Talk to a grower, not a script

Tell us your space and what you want to grow. We'll point you to the gear that fits, and tell you what you can skip.

Call 0481 735 126

Mon–Fri 8:30am–5:30pm · Sat 9am–3pm

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