A drip chamber for an infusion tube, including: a first end (106) including a drip tube (108) a second end (110) including an exit port (112) and a wall (114) connecting the first and second ends and including an interior surface (116) with a hydrophobic portion (118). The drip chamber includes a space (122) enclosed by the interior wall and the first and second ends. The hydrophobic portion (118) of the interior surface repels liquid contacting the hydrophobic coating. The hydrophobic portion of the interior surface enables light to refract through the hydrophobic portion and the wall in the same manner as is the case when the hydrophobic portion is not present on the interior surface.
