Choose Thermo Scientific™ SureSTART™ 1.7 mL High Recovery Glass Screw Top Microvials, Performance Level 3, when you need to maximize the injection volume for <2 mL samples. With outer dimensions of 12x32 mm, these clear or amber glass microvials have an internal conical reservoir that provides a total usable volume of 1.5 mL and a residual volume of 4 ?L. This is a Performance Level 3 vial, which means it is designed to protect your most valuable samples and deliver consistent, reproducible results for your most demanding analyses.