This Burette has a transparent acrylic pipe and a leak proof TPX stopcock fitted with a self lubricating PTFE plug. Each Burette is individually calibrated to give maximum accuracy. Acrylic body is unaffected by dilute mineral acids & bases except Hydrofluoric acide & Ammonium Hydroxide. The pH range of 1-14 is ideal and can be used up to 5%wt/wt of acids or 30% bases.