These are materials which, after drying under the specified conditions, are recommended for use as primary standards in the standardization of volumetric solutions. The following are recommended for use as primary standards.
| 1x | Acetate Buffer pH 2.8 | EUR 65.00 |
| 1x | Buffer Solution pH 2.2 | EUR 65.00 |
| 1x | Buffer Solution pH 2.0 | EUR 65.00 |
| 1x | Tris-acetate Buffer Solution pH 8.5 | EUR 65.00 |
| 1x | Acetate Buffer pH 4.4 | EUR 65.00 |
| 5x | Discount for non-paper Certificate of Analysis | EUR -5.00 |