Features:
3 packs of popular pH buffer solutions,pH4.00, pH6.86 and pH9.18
Simple to use. Just add 250ml per-powder packet
Easy 3-step procedure is written atthe back of the packet.

how to prepare the buffer solution:
Solid material for pH4.01, pH6.86, pH9.18 buffer solution are provided in a set of sachets.
Glass jars or beakers are recommended as the solution containers.

Take making the 250ml buffer solution of pH6.86 as an example:
1. Put the pH6.86 buffer solution(in the green sachet) in a jar (the volume should be no less than 250ml)
2. Fill the far with 250ml distill water.
3. Place a glass stick in the solution, swirling it until the white powder dissolved.
4. Store the pH buffer solution in a dry place with the temp. of 20-25oC. Attach a label on it for further use.
5. For the further calibration, Ensure that there is a contant supply of fresh buffer solution in contact with the probe.
Discard the solution after use.