The ornamental design for an analyticalinstrument, as shown and described.
FIG. 1 is a front, top, and right side perspective view of an analytical instrument;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines represent portions of the analytical instrument and form no part of the claimed design. The dot-dashed line represents a boundary between the claimed portion and non-claimed portion which forms no part of the claimed design.