Bluelab 7.0 Calibration Solutions, 18ml

pH 7.0 Calibration Solution, 18ml Sachets

A pH meter is only as accurate as its last calibration, and single-use sachets keep that calibration solution fresh and uncontaminated every time. Bluelab 7.0 Calibration Solution is a pH 7 calibration solution packaged in 18ml sachets, sold in a box of 30.

Sold as a box of 30 individual 18ml sachets.

Key Features & Benefits

• pH 7.0 calibration point — calibrates pH meters and controllers to the neutral pH 7 reference point.
• 18ml single-use sachets — each sachet is sized for one calibration, keeping the solution fresh and uncontaminated.
• Box of 30 count — enough sachets for regular calibration across a full growing season.
• Compatible with standard pH meters — use with any pH meter or controller that calibrates against a pH 7 reference point.

Who Should Use Bluelab 7.0 Calibration Solution

This fits any grower running a pH meter or controller who needs a reliable pH 7 reference point for regular calibration, especially as part of a two-point calibration routine.

About Bluelab 7.0 Calibration Solution

Bluelab 7.0 Calibration Solution is a pH 7 reference solution in single-use 18ml sachets, sold as a box of 30.

Frequently Asked Questions

How do I use this in a two-point calibration?

Pair this pH 7 solution with a pH 4 solution, such as Bluelab's own 4.0 Calibration Solution, to calibrate your meter at two points across its working range. Two-point calibration is generally more accurate than calibrating at a single reference point alone.

What size are the sachets?

Each sachet holds 18ml of pH 7 calibration solution, sold in a box of 30. That's enough for regular calibration across a full growing season.

Why use single-use sachets instead of a bottle?

Single-use sachets keep each calibration solution fresh and free of contamination from repeated bottle use, so every calibration starts with a clean, accurate reference. That freshness matters because a contaminated calibration solution can throw off your meter instead of correcting it.

Can I use this with any pH meter?

Yes, pH 7 calibration solution works with any pH meter or controller that calibrates against a pH 7 reference point. Check your meter's manual for its recommended calibration routine.