MEASUREMENT 01
Full height
Measure from the base to the very top, including the cap. Place the vial on paper, mark both ends and measure between your marks.
THE FIT STARTS WITH THE VIAL
Two measurements. A better fit.
Measure in millimeters. A ruler works; calipers help with precision.
MEASUREMENT 02
Widest diameter
Measure across the widest part of the vial. Include the cap diameter if it is wider than the body. Mark the edges on paper and measure between them.