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As standard buffering solutions, the buffers pH 6.865 and PL 7 are available in 250 ml bottles with a high accuracy to ± 0.02 pH
With a high accuracy: ±0.02 pH, this standard buffering solution is traceably certified to PTB/NIST and therefore safe for use.
As a standard buffering solution, this buffer pH 9.180 (PL 7) is available in a 250 ml bottle.