This Burette has a transparent acrylic pipe and a leakproof 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 Hydrofloric Acid & Ammonium Hydroxide. The pH range 1-14 is ideal and can be used upto 5% wt/wt of acids or 30% bases.