Description
Buffer solution pH 4.01/7.00/9.21 is a ready-to-use pH reference assortment filled in 20 mL seal-edge sachets. The pack supplies three nominal values—pH 4.01, 7.00 and 9.21—with ten sachets of each, giving thirty single-use portions in total. Values are stated at 25 °C, aligning with common laboratory conditions for pH electrode and meter calibration. Seal-edge sachet packaging keeps every aliquot closed until needed and supports clean, contamination-conscious handling during multi-point calibrations. The combination covers acidic, neutral and alkaline regions frequently required in standard pH sensor adjustment protocols. This buffer set from manufacturer Mettler-Toledo OnLine is delivered as one package unit with a gross weight of 0,729 kg. Discrete sachets help avoid carry-over and ageing effects that can appear when buffers are repeatedly opened from larger bottles. The format fits quality-control, research and production laboratories that prefer fresh buffer portions for reliable everyday pH measurement workflows.
This article is part of pH buffers & conductivity standards, in Buffers & pH solutions.
Key features
- Pack size: 3 × 10 pcs, 20 mL seal-edge sachets
- pH values: 4.01 / 7.00 / 9.21
- Reference temperature: 25 °C
- Packaging: Seal-edge sachets
- Format: Single-use portions
- Technical Information Sheet:
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Questions about Rainbow I (3 x 10 sachets 20 mL)
What is this article?
Rainbow I (3 x 10 sachets 20 mL) is the article on this page. Luminix Health distributes Mettler-Toledo OnLine for laboratory use. It sits in pH buffers & conductivity standards, inside Buffers & pH solutions, in Lab chemicals.
A pH buffer for calibration has a stated pH at a stated temperature, often traceable. A conductivity standard has a stated conductivity. They are not general reagents and they should not be poured back into the bottle. The temperature of the measurement has to be the temperature on the label, or the meter has to compensate.
A buffer resists a change in pH when a little acid or base is added. It does that because a weak acid and its conjugate base are both present. A pH buffer used to calibrate a meter has a stated value at a stated temperature. A biological buffer such as Tris or HEPES is chosen because it holds the pH of a living system and does not poison it. Conductivity standards are the sister articles for a conductivity meter. The ions are on PubChem. Electrode calibration practice sits with EURAMET and BELAC.
Which category should I open next?
The category is Buffers & pH solutions. The sub-category is pH buffers & conductivity standards. The catalogue is Lab chemicals.
Shelves beside this one are Biological buffers (Tris, HEPES, MOPS) and Buffers (other).
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Luminix Health distributes this article from the heart of Europe. Delivery across Europe, two to five days when in stock. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
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