Certified sec. standard reference buffer solution

Descrição detalhada : The certified secondary standard reference buffer solution (potassium dihydrogen phosphate/di-sodium hydrogen phosphate) is gravimetrically prepared using high-quality reagents 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. It is qualified using a 5-point calibration method, in accordance with DIN 19268, against certified primary reference standards as per DIN 19266.
Armazenamento : 15-25C
Embalagem : 1X1EA