The ornamental design of an I-beam level, as shown and described.
FIG. 1 is an isometric view of an I-beam level incorporating our new design;
FIGS. 2 and 3 are side elevation views thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIGS. 6 and 7 are end elevation views thereof.
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.
The article is shown with a symbolic break in its length and width. The appearance of any portion of the article between the break lines forms no part of the claimed design.