We claim the ornamental design for a calibration station, as shown and described.
FIG. 1 is a first perspective view of a first calibration station according to our new design.
FIG. 2 is a second perspective view of the first calibration station design.
FIG. 3 is a top plan view of the first calibration station.
FIG. 4 is a bottom plan view of the first calibration station.
FIG. 5 is a front elevation view of the first calibration station.
FIG. 6 is a rear elevation view of the first calibration station.
FIG. 7 is a right-side elevation view of the first calibration station; and,
FIG. 8 is a left-side elevation view of the first calibration station.
The broken lines shown in each of FIGS. 1-8 depict one or more of a calibration gas receptacle, calibration station housing, electrical connectors and switches, a display, and an electrical cord clasp, all of which form no part of the claimed first calibration station.