Instrument

The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee. FIG. 1 is a perspective view of an instrument showing a first embodiment of our new and ornamental design; FIG. 2 is an alternate perspective view thereof; FIG. 3 is an alternate perspective view thereof; FIG. 4 is an alternate perspective view thereof; FIG. 5 is a rear elevation view thereof; FIG. 6 is a front elevation view thereof; FIG. 7 is a side elevation view thereof; FIG. 8 . is an opposite side elevation view thereof; FIG. 9 is a top plan view thereof; FIG. 10 is a bottom plan view thereof; FIG. 11 is a perspective view of an instrument showing a second embodiment of our new and ornamental design; FIG. 12 is an alternate perspective view thereof; FIG. 13 is an alternate perspective view thereof; FIG. 14 is an alternate perspective view thereof; FIG. 15 is a front elevation view thereof; FIG. 16 is a side elevation view thereof; FIG. 17 is an opposite side elevation view thereof; FIG. 18 is a top plan view thereof; FIG. 19 is a perspective view of an instrument showing a third embodiment of our new and ornamental design; FIG. 20 is an alternate perspective view thereof; FIG. 21 is an alternate perspective view thereof; FIG. 22 is an alternate perspective view thereof; FIG. 23 is a front elevation view thereof; FIG. 24 is a side elevation view thereof; FIG. 25 is an opposite side elevation view thereof; and, FIG. 26 is a top plan view thereof. The broken lines are for illustrative purposes only and form no part of the claimed design. The radiating lines illustrate the glow of the illumination emanating from the instrument.