The Yellow Square pH calibration powder kit contains pH 4.01, pH 6.86 and pH 9.18 powders for three-point pH meter calibration. Each sachet is dissolved in 250 ml of distilled or deionised water at 25 °C, and together the points span the acidic, neutral and alkaline parts of the scale.
Specifications
| Parameter | Value |
|---|---|
| pH values | pH 4.01 – 6.86 – 9.18 |
| Number of powder types | 3 |
| Calibration type | three-point |
| Water per sachet | 250 ml, distilled or deionised |
| Water temperature | 25 °C |
| Use | pH meter calibration at home and during lab measurements |
Which part of the scale each point covers
| Buffer | Part of scale |
|---|---|
| pH 4.01 | acidic |
| pH 6.86 | near neutral |
| pH 9.18 | alkaline |
What you get
- Three references in one purchase — pH 4.01, pH 6.86 and pH 9.18 powders.
- Adjustment across the full range — acidic, neutral and alkaline parts of the scale.
- No solutions to store — each sachet is mixed into 250 ml of water just before calibration.
- Consistent conditions — distilled or deionised water at 25 °C.
- Home and lab — the kit is intended for both.
Who it is for
Anyone measuring liquids of varying acidity who wants accuracy across the whole scale: lab technicians, process engineers, chemistry teachers, agronomists and growers, and aquarium keepers working with different water types.
Who it is not for
Owners of meters that support only one or two calibration points, since some powders would go unused, and those who want ready-made liquid solutions or lack distilled or deionised water.
Uses and compatibility
Three-point pH meter calibration at home and during lab measurements. Prepare three solutions in separate containers, one sachet per 250 ml of distilled or deionised water at 25 °C, and work through the points in the order your meter's manual gives, rinsing the electrode between them.
What's in the box
pH 4.01 calibration powder, pH 6.86 calibration powder, pH 9.18 calibration powder.
Questions and answers
In what order should I do the three points?
Follow your meter's manual; most often you start with pH 6.86, then move to pH 4.01 and pH 9.18.
Should I rinse the electrode between solutions?
Yes, with distilled or deionised water, so no buffer is carried into the next one.
How much solution does one sachet make?
250 ml: the sachet contents are dissolved in that volume of distilled or deionised water at 25 °C.
Why three points instead of one?
One point adjusts the meter only near its own value, while three cover the acidic, neutral and alkaline parts of the scale.
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