The Industrial Design consists of the features of shape, pattern, ornament and configuration of the sample collector shown in the drawings. The drawings show three variants of a design which do not differ substantially from each other. Figures 1 to 10 show the first variant. Figures 11 to 20 show the second variant. Figures 21 to 30 show the third variant. Drawing(s)/photograph(s) of the design is (are) included.Fig. 1 is a top plan view of the sample collector illustrating the first variant of the present design, with the lid shown in the open position;Fig. 2 is a bottom plan view of the present design as shown in Fig. 1;Fig. 3 is a front view of the present design as shown in Fig. 1;Fig. 4 is a rear view of the present design as shown in Fig. 1;Fig. 5 is a left side view of the present design as shown in Fig. 1;Fig. 6 is a right side view of the present design as shown in Fig. 1;Fig. 7 is a top, rear, right side perspective view of the present design as shown in Fig. 1;Fig. 8 is a top, rear, right side perspective view of the sample collector as shown in Fig. 1, with the tube removed;Fig. 9 is a top, front, left side perspective view of the present design of Fig. 1, with the lid shown in the closed position;Fig. 10 is a cross-sectional view of the sample collector shown in Fig. 5, taken along the line B-B in Fig. 4;Fig. 11 is a top plan view of the sample collector illustrating the second variant of the present design with the lid shown in the open position;Fig. 12 is a bottom plan view of the present design as shown in Fig. 11;Fig. 13 is a front view of the present design as shown in Fig. 11;Fig. 14 is a rear view of the present design as shown in Fig. 11;Fig. 15 is a left side view of the present design as shown in Fig. 11;Fig. 16 is a right side view of the present design as shown in Fig. 11;Fig. 17 is a top, rear, right side perspective view of the present design as shown in Fig. 11;Fig. 18 is a top, rear, right side perspective view of the sample collector as shown in Fig. 11, with the tube removed;Fig. 19 is a top, front, left side perspective view of the present design of Fig. 11, with the lid shown in the closed position;Fig. 20 is a cross-sectional view of the sample collector shown in Fig. 15, taken along the line E-E in Fig. 14;Fig. 21 is a top plan view of the sample collector illustrating the third variant of the present design with the lid shown in the open position;Fig. 22 is a bottom plan view of the present design as shown in Fig. 21;Fig. 23 is a front view of the present design as shown in Fig. 21;Fig. 24 is a rear view of the present design as shown in Fig. 21;Fig. 25 is a left side view of the present design as shown in Fig. 21;Fig. 26 is a right side view of the present design as shown in Fig. 21;Fig. 27 is a top, rear, right side perspective view of the present design as shown in Fig. 21;Fig. 28 is a top, rear, right side perspective view of the sample collector as shown in Fig. 21, with the tube removed;Fig. 29 is a top, front, left side perspective view of the present design of Fig. 21, with the lid shown in the closed position; and,Fig. 30 is a cross-sectional view of the sample collector shown in Fig. 25, taken along the line H-H in Fig. 24.