These class A (DIN ISO 385 Compliant) borosilicate glass 3.3 burettes have a PTFE key stopcock with blue-printed graduations with subdivisions (±0.03mL tolerance). The class B (DIN ISO 385 Compliant) burettes have a glass key stopcock, which requires lubrication but offers the smoothest, most authentic control. The burettes are used in labs and healthcare settings to measure liquids precisely and are more accurate than a graduated cylinder. They are often used in quantitative chemical analysis to measure the volume of a liquid or gas. The stand holds a single burette and is made of seasoned wood. It has black nylon thumb screws to help securely fasten burettes in place to prevent them from breaking or spilling contents. They are designed to store liquids in the laboratory but can also be used at home.
- Class A or Class B borosilicate glass 3.3
- Blue printed graduation lines (±0.03mL tolerance)
- Class A burette is made with a PTFE key stopcock; class B has a glass key stopcock
- Temperature range: -515°C to 565°C
- 91110 to 91117 have Schellbach stripe; autoclavable