Make sure that your pH meter is properly calibrated before use. pH Meter Buffer Solution for pH 4.01 will allow you to calibrate you pH meter to a pH of 4.01. A properly calibrated pH meter makes your testing more accurate.
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I have some packs of the 4.0 and the 7.0 that I use when recalibrating my pH meter before using it. I keep the fluid in a container and get multiple uses out of it, so the cost isn't very much.
I use this and the 7.0 solution to calibrate my pH meter and get accurate results. No sense having a pH meter without taking care of it.
This and the 7.00 solution are needed each time you brew to get accurate pH readings. After using it I save it in a small jar and can get a couple of uses out of it.
pH meters need to be calibrated to be accurate and this is the fluid I use. I save the contents in a plastic vial so i can get a few uses from it.
Even though its "one use" I keep the contents in a glass jar and get several uses out of it. I use a new package after every 5 uses.