These new Bottle Top Dispensers are priced significantly better than virtually anything of its type. The dispensers feature a 30mm thread and come complete with five additional adapters (sizes 28mm, 32mm, 36mm, 40mm and 45mm) allowing customers to use them right out of the box. They are fully autoclavable and work with most laboratory bottles. The accuracy of these dispensers is exceptional and offers the best value in the industry. All wetted parts made from PTFE and borosilicate glass for maximum chemical resistance. Sets include a 100mL borosilicate glass media bottle. Volume range of 0.25-2.5mL with 0.05mL increments.