Certified sec. standard reference buffer solution

Descrição detalhada : The certified secondary standard reference buffer solution (di-sodium tetraborate decahydrate) is gravimetrically prepared from high-quality sodium borate in high-purity water. Its pH value is measured by differential potentiometry with two platinum hydrogen electrodes against primary certified reference materials from NIST & PTB. The pH is qualified using the 5-point calibration method, in accordance with DIN 19268, against certified primary reference standards as per DIN 19266.
Armazenamento : 15-25C
Embalagem : 1X1EA