Buffer. TBS / TWEEN 20 Buffer, 20X, Storage Condition: Room temperature, Biotechnology grade, Concentration (mM - mMol): 380 - 420, pH (1:20, Water) at 25 degree Celcius: 7.50 - 7.70, Concentration (mM - mMol): 380 - 420, pH (1:20, Water) at 25C: 7.50 - 7.70, 4L