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The choice of the second buffer depends on your application: if you measure values below pH 7, use pH 4 as a second buffer. If you measure values above pH 7, use pH 10 as your second buffer. Some of our pH meter use 3 points calibration, keep in mind to always start with pH 7 first and others after.
For the calibration of the XPS spectrometer, N 200 ML of Mg was dosed onto the Mo(100) surface at room temperature. This Mg film showed no 0, C or S impurities within the AES or XPS detection limit (< 1 at%). The linearity (dispersion) of the spectrometer was calibrated