The ornamental design for a watertightuniversalhousing for electronic devices, as shown and described.
FIG. 1 is a perspective view of a watertight universal housing for electronic devices showing my new design.
FIG. 2 is a front elevational view thereof, the rear view being a mirror image.
FIG. 3 is a left side elevational view thereof, the right side being a mirror image.
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken line showing in the drawings is for the purpose of illustrating unclaimed portions of the watertight universal housing for electronic devices and form no part of the claimed design.