The ornamental design for a specimen preparing apparatus, as shown and described.
FIG. 1 is a perspective view of the top, front and right side of a specimen preparing apparatus showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof; and,
FIG. 8 is a perspective reference view with the lid in open condition thereof.
The broken lines shown in the interior of specimen preparing apparatus in FIG. 8 are included for the purpose of illustrating a portion of the specimen preparing apparatus that forms no part of the claimed design.