Class A Burettes are permanently marked with an individual serial number and supplied with a Certificate of Graduation Accuracy. Designed from ASTM Specification E287, Class A requirements. Delivery stem of No. 42497 is 115mm long to meet requirements of potentiometric titration burettes (ASTM D664). Durable white ceramic enamel scale.
Class B Burettes have a black ceramic enamel scale. Designed from ASTM Specification E287, Class B requirements.