2-Amino-4,5-dimethoxybenzoic acid, 98%, 10g

Sulfur Calibration Mixtures: Di-n-butyl sulfide in Heavy White Oil (less than 20mg/kg S) Unit : 10mL screw-capped bottle Light White Mineral Oil Heavy White Mineral Oil (20 cSt at 40°C) (70 cSt at 40°C)

Erythromycin, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 114-07-8

Conductance @ 20°C [500 µmho/cm]