Use Performance Level 1 Thermo Scientific™ SureSTART™ 2 mL Polypropylene Screw Top Microvials for everyday chromatography analysis of <2 mL samples. They provide an affordable choice and can be used with all HPLC/UHPLC instrument types. These clear plastic 2 mL screw top microvials are Specification Certified to ensure autosampler compatible physical dimensions. Seal these screw top vials with 9 mm screw caps and septa.