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Why does my Bottle of pH Buffer State a Temperature on the Label?

Changes in temperature affect a pH reading. This is why you will usually see the temperature printed on the side of the bottle of pH buffer solutions. The buffer will be closest to its stated pH at that temperature (usually 20oC or 25oC)

When calibrating a pH meter with automatic buffer recognition, it is recommended to use the correct buffer. So please check the manufacture’s instructions to see which ones they suggest, i.e. 20oC or 25oC. It can make a difference to the calibration slope or how quickly the meter stabilizes.

To make the purchased of buffer solution easy, we have listed a range of 20oC and 25oC pH buffers below, with a link to the relevant webpages.

25oC Buffers

  • 1145585 – Buffer Solution pH4.00 (Red) ± 0.010 @ 25°C 500ml          
  • 1145586 – Buffer Solution pH7.00 (Yellow) ± 0.010 @ 25°C 500ml     
  • 1145550 – Buffer Solution pH10.00 (Blue) ± 0.010 @ 25°C 500ml       

20oC Buffers

  • 1144885 – Buffer Solution pH4.00 (Red) ± 0.01 @ 20°C 500ml
  • 1144955 – Buffer Solution pH7.00 (Yellow) ± 0.01 @ 20°C 500ml
  • 1145008 – Buffer Solution pH10.00 (Blue) ± 0.01 @ 20°C 500ml

Please note the manufacturer instructions for storage of your pH probe.

Usually, they need to be kept in a storage solution. If the pH probe dries out, it may become damaged and not give you accurate results. Why not purchase some TrueScience storage solution too?

  • 1206841 – pH Electrode Storage Solution 250ml                  

For further information on pH, please consult our Product Guides section on:

Along with numerous blogs, we have produced on the subject of pH.

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