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As you will see on our website, we manufacture a wide range of buffer solutions for a variety of applications. However, for 99% of the time buffer 7 and buffer 4 solution are the two you need to perform a calibration. If you are measuring mostly in the alkaline scale, then you might use buffer 7 and buffer 10, although buffer 10 is not as stable a solution as buffer 4, and therefore has a much shorter life once exposed to air.
You can use your pH 4 buffer. Just place a few drops of that inside the cap to keep the electrode moist.
Yes, just make sure you let it defrost in a sink incase the bottle cracked when it froze.
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- Dwayne, AL