Schellbach Burette, 50mL - Class A, Includes Calibration Certificate - Glass Stopcock - Blue Graduations - Borosilicate Glass

This 50mL Schellbach burette is made from heavy duty borosilicate 3.3 glass and is calibrated to deliver to Class A accuracy under DIN ISO 385, with 0.1mL graduations and a tolerance of ±0.05mL. A calibration certificate from an ISO-accredited testing laboratory is included, documenting that this burette was measured against a traceable standard. The Schellbach design adds a white backing strip carrying a central blue line, running the length of the tube opposite the graduations. Viewed through the liquid, the line converges to a sharp point at the meniscus, giving a more consistent reading than an unaided curved surface. The blue graduations are chemically resistant and contrast against clear and lightly colored solutions. An attached glass key stopcock controls delivery down to partial drops. At 50mL with 0.1mL subdivisions, this is the standard analytical burette configuration. Borosilicate glass is autoclavable, with chemical durability across common titrants.