The ornamental design for handle of handheld lens, is as shown and described.
FIG. 1 is a perspective view of a handle of handheld lens showing my new design in which the broken line is for illustrative purposes only and forms no part of the claimed design;
FIG. 2 is a perspective view of a handle of handheld lens showing my new design in which the broken line is for illustrative purposes only and forms no part of the claimed design;
FIG. 3 is a front view thereof in which the broken line is for illustrative purposes only and forms no part of the claimed design, with the opposite side being a mirror image thereof;
FIG. 4 is a left view thereof in which the broken line is for illustrative purposes only and forms no part of the claimed design;
FIG. 5 is a right view thereof in which the broken line is for illustrative purposes only and forms no part of the claimed design;
FIG. 6 is a top view thereof in which the broken line is for illustrative purposes only and forms no part of the claimed design; and,
FIG. 7 is a bottom view thereof in which the broken line is for illustrative purposes only and forms no part of the claimed design.