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The ornamental design for a hydrometer, substantially as shown and described. |
FIG. 1 is a top perspective view of a hydrometer showing my new design;
FIG. 2 is a side elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a side elevational view of another embodiment of my new design of FIGS. 1-5 with a stem sheath added thereto;
FIG. 7 is a bottom plan view of FIG. 6.
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