纯度规格:roll L 4.8 m , with color scale, pkg of 3 rolls, pH-range 0.5-5.0 (ACILITTM), pH-range 5.5-9.0 (NEUTRALITTM), pH-range 9.5-13.0 (ALKALITTM), MQuant®
纯度规格:certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 3.639 / pH(S) = 3.557 (25°C) Certipur®