What's the difference between a pH buffer sachet and a pH buffer capsule?

pH buffers are supplied in a wide range of formats and it can sometimes be confusing, here is a simple guide to the various types of buffer supplied. [caption id="" align="alignleft" width="479" caption="pH Buffer capsules"][/caption]                                 pH buffer Capsules - these are a small powdered buffer, which is mixed with water to give a fixed volume of buffer. They give a long shelf life and the advantage that the buffer is always made fresh.   pH buffer Sachets - Single use sachets, ideal for use in the field, a small amount of buffer is in the pouch you tear off the corner and insert the probe into the liquid. always fresh, use once and throw away [caption id="" align="alignleft" width="507" caption="Colour Coded pH buffers"][/caption]                               Colour coded buffers - availabe in a range of different bottles, these buffers are colour coded so that you can be sure which buffer you are using 4 is coloured red, 7 is coloured yellow and 10 is coloured blue. Camlab hold a wide range of buffer in stock in cambridge for next day delivery. We are happy to advise on the correct choice of buffer for your needs.