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, wherein the portions in phantom form no part of the claimed design and wherein the break lines indicate indeterminate length;
FIG. 2 is a side elevation view thereof;
FIG. 3 is an opposite side elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIGS. 6 and 7 are and elevation views thereof;
FIG. 8 is an isometric view similar to FIG. 1 illustrating another embodiment of an I-beam level incorporating our new design, wherein the portions in phantom form no part of the claimed design and the end elevation views are the same as illustrated in FIGS. 6 and 7;
FIGS. 9 and 10 are side elevation views thereof;
FIG. 11 is a top plan view thereof,
FIG. 12 is a bottom plan view thereof;
FIG. 13 is an isometric view similar to FIGS. 1 and 8 illustrating another embodiment of an I-beam level incorporating our new design, wherein the portions in phantom form no part of the claimed design and the end elevation views are the same as illustrated in FIGS. 6 and 7;