This Burette has a transparent acrylic body and a leakproof stopcock fitted with a self lubricating PTFE plug. Each Burette is individually calibrated to give maximun accuacy. Acrylic body is unaffected by dilute mineral acids & bases except Hydrofloric Acid & Ammonium Hydroxide. The pH RANGE OF 1-14 is ideal and can be used up to 5% wt/wt of acids or 30% bases.