pH Reference Standard Buffer Solution pH 4.00 500ML, 1L, 4L
Color Coded Red
Link Gulf BS0170-04R-E 500ml VWR BDH5018-500ML
Link Gulf BS0170-04R-F 1000ml Not available
Link Gulf BS0170-04R-G 4000ml VWR BDH5018-4L
pH 4.00 ± 0.01 NIST Traceable
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VWR information
https://en.wikipedia.org/wiki/PH