Yellow Square ORP 256 mV calibration powder is a sachet for preparing 50 ml of reference solution used to check and calibrate ORP meters. Dissolve it in distilled or deionised water at 25 °C, immerse the electrode, stir for 30 seconds and, once the reading settles, set the meter to 256 mV. A correction table on the back of the pack covers other solution temperatures.
Specifications
| Parameter | Value |
|---|---|
| ORP reference value | 256 mV |
| Reference temperature | 25 °C |
| Solution volume per sachet | 50 ml |
| Form | Powder in a sachet |
| Water for the solution | Distilled or deionised, 25 °C |
| Stirring with the electrode | 30 s |
| Temperature correction | Table on the back of the pack |
| Powder shelf life | Unlimited while sealed |
| Storage | Tightly closed pack, dry and dark place, room temperature |
What you get
- A 256 mV reference point — the reference value at 25 °C for checking an ORP meter.
- Fresh solution every time — mix a sachet with 50 ml of water right before calibration.
- Temperature adjustment — a correction table is printed on the back of the pack.
- A simple routine — immerse the electrode, stir for 30 seconds, let the reading settle and turn the screw.
- Compact storage — dry powder in a sachet, no bottles of liquid.
Who it is for
ORP meter owners who want to check their instrument regularly, lab staff doing laboratory work and home users who monitor the redox potential of water.
Who should look elsewhere
This is a reference for ORP only: pH or TDS meters need different calibration solutions. Without distilled or deionised water on hand you will not be able to prepare a correct solution.
Applications and compatibility
Preparing a reference buffer solution to check and calibrate ORP (redox) meters, laboratory work and household use. The supplier does not list specific instrument models.
What is in the box
A sachet of ORP 256 mV calibration powder for preparing 50 ml of solution.
Questions and answers
How much water does one sachet need?
Dissolve the contents in 50 ml of distilled or deionised water.
What if the water is not at 25 °C?
Use the temperature correction table on the back of the pack and compare the reading against it.
How long should I stir with the electrode?
About 30 seconds, then wait for the reading to stabilise.
How should I store unused powder?
In a tightly closed pack, in a dry, dark place at room temperature.
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