Measured with a combined glass electrode after 5-point calibration according to DIN 19268 (expanded measurement uncertainty +/-0.01) with ref.buffer solutions according to DIN 19266, prepared with primary reference materials, at the accredited laboratory according to DIN EN ISO/IEC 17025.
Diviations of pH (delta pH) at varius temperatures:
(5?°C)
+ 0.22
(10?°C)
+ 0.16
(15?°C)
+ 0.10
(20?°C)
+ 0.05
(25?°C)
+/- 0
(30?°C)
- 0.04
(35?°C)
- 0.07
(40?°C)
- 0.11
(45?°C)
- 0.14
(50?°C)
- 0.16
Traceable to primary reference materials from: NIST 189c, 188, 185h, 186 Ig, 186IIg, 187e PTB OX-179/10,TA-212/11,PHT-232/12,PHO-243/12,BO-211/11 NIST: National Institute of Standards and Technology PTB: Physikalisch-Technische Bundesanstalt
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