The Varispenser® adjustable-volume bottle-top reagent dispenser fits on external threads of 45mm and comes complete with a telescopic tube, wrench, and 3 adapters. The best way of taking aliquots of liquid from large supply bottles is by using a Varispenser® adjustable-volume bottle-top reagent dispenser. It is capable of exact reproducible dispensing that does not waste any reagent. When dealing with aggressive liquids, such as solvents, it guarantees the best possible protection for the users and their laboratory. The Varispenser® features a PFA-sealing of the slide piston to prevent jamming. It allows fine adjustment depending on the viscosity of the liquid, with a rapid volume setting using a precise graduation scale. The Varispenser® has a patented safety valve for de-airing without loss of reagent, a telescopic tube for use with high bottles, and a channel-sealing cap that prevents media contact. There is no crystallization of liquid, and no dripping when the valve is closed. It is autoclavable and extremely chemical-resistant. Once purchased, all dispensers are non-returnable. Autoclavable. Chemical Resistant. Size: 5. Volume Range: 10.00 To 50.0mL. Outer Diameters: 32mm, 38mm, And 40mm. Dispensing Steps: 1.00mL. Dead Volume: 0.21mL. Thread: 45mm. Inaccuracy: +/-0.5%. Imprecision: Less Than Or Equal To 0.1%. Test Conditions: Liquid: Bidistilled Water; Reference Temperature: 20 To 25°C Constant To +/-0.5°C; Number Of Determinations: 10, In Accordance With EN ISO 8655-5. Eppendorf® #: 4960000051.