To make sure that you make accurate measurements then you have to calibrate your pH meters frequently.... Show more
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This prevents that microbes attach themselves to your meter which causes inaccurate measurements. The pH buffer 4.01 is a calibration fluid for your pH meter. You have to calibrate your device every two weeks. The pH calibration fluid from Milwaukee is made for pH meters that measure pH up to 4.01. on the package you can read the temperatures and values to make an accurate measurement.