Custom Premix Selecting "Custom Premix" option means that all of the beads you have chosen will be premixed in manufacturing before the kit is sent to you.
di-Sodium oxalate volumetric standard, secondary reference material for redox titration, traceable to NIST Standard Reference Material (SRM) Certipur® Reag. USP. CAS 62-76-0, pH 8 (30 g/l, H₂O, 20 °C).更多 >>
di-Sodium oxalate volumetric standard, secondary reference material for redox titration, traceable to NIST Standard Reference Material (SRM) Certipur® Reag. USP. CAS 62-76-0, pH 8 (30 g/l, H₂O, 20 °C). 更少<<
Potassium tetraoxalate dihydrate certified secondary standard reference material for pH measurement; directly traceable to primary reference material from NIST/PTB pH (S) = 1.67₉ (25°C) Certipur®. pH 1.7 (12.6 g/l, H₂O, 25 °C).更多 >>
Potassium tetraoxalate dihydrate certified secondary standard reference material for pH measurement; directly traceable to primary reference material from NIST/PTB pH (S) = 1.67₉ (25°C) Certipur®. pH 1.7 (12.6 g/l, H₂O, 25 °C). 更少<<