We claim the ornamental design for a calibration station, as shown and described.
FIG. 1 is a first perspective view of a calibration station according to our new design.
FIG. 2 is a second perspective view thereof with a mouthpiece attached thereto.
FIG. 3 is a third perspective view thereof with a breath alcohol content analyzer and a calibration gas tank attached thereto.
FIG. 4 is a fourth perspective view thereof.
FIG. 5 is a top plan view thereof.
FIG. 6 is a top plan view thereof with a mouthpiece attached thereto.
FIG. 7 is a bottom plan view thereof.
FIG. 8 is a front elevation view thereof.
FIG. 9 is a front elevation view thereof with a mouthpiece attached thereto.
FIG. 10 is a rear elevation view thereof
FIG. 11 is a right-side elevation view thereof; and,
FIG. 12 is a left-side elevation view thereof.
The broken lines shown in each of FIGS. 2, 3, 6, and 9 depict one or more of a breath alcohol content analyzer, a calibration gas tank, and a mouthpiece, all of which form no part of the claimed design.