The ornamental design for a clampmeter, as shown and described.
FIG. 1 is a front top left side perspective view of clamp meter having the inventive design;
FIG. 2 is a front bottom left side perspective view of the clamp meter shown in FIG. 1;
FIG. 3 is a rear top left side perspective view of the clamp meter shown in FIG. 1;
FIG. 4 is a rear bottom left side perspective view of the clamp meter shown in FIG. 1;
FIG. 5 is a front side orthogonal view of the clamp meter shown in FIG. 1;
FIG. 6 is a rear side orthogonal view of the clamp meter shown in FIG. 1;
FIG. 7 is a right side orthogonal view of the clamp meter shown in FIG. 1;
FIG. 8 is a bottom side orthogonal view of the clamp meter shown in FIG. 1; and,
FIG. 9 is a top side orthogonal view of the clamp meter shown in FIG. 1.
The broken line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.