Bluelab pH Calibration Solution 4.0 is a precision reference solution used to calibrate pH pens, meters, and probes, ensuring ongoing measurement accuracy in nutrient solutions and water. Regular calibration is essential for maintaining reliable pH readings, particularly in hydroponic systems where small variations can influence nutrient availability.
This solution provides a stable pH 4.0 reference point and is used as part of a two-point calibration process alongside pH 7.0 calibration solution. By calibrating at two points, the pH device can correctly interpret both neutral and acidic ranges, helping maintain consistent and dependable readings across typical growing conditions.
Bluelab recommends routine calibration to account for probe drift over time. Using fresh calibration solution during each calibration cycle supports consistent results and helps extend the functional reliability of pH measurement equipment. This solution is formulated specifically for compatibility with Bluelab pH products and is intended strictly for calibration purposes, not for storage or adjustment of pH in nutrient solutions.
Accurate reference point
Provides pH 4.0 calibration
Supports routine care
Used in regular calibration
Supports accuracy
Maintains reliable readings
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Not sure it suits your setup? Call our Youngtown team on
0481 526 666.
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
Bluelab pH 4.0 Calibration Solution works exactly as it should and is my go-to solution for the second point when calibrating a pH meter.
There is not much more to say beyond that. It is reliable, easy to use and gives me confidence that the meter is calibrated accurately across the range commonly used for hydroponics.
For transparency, I am the owner of Hydro Oasis. This is the pH 4.0 calibration solution I personally use and recommend.
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