Water temperature gauge
FIG. 1 is a left, front perspective view of a water temperature gauge showing my new design; 
     FIG. 2 is a right side elevational view thereof; 
     FIG. 3 is a rear elevational view thereof; 
     FIG. 4 is a front elevational view thereof on a reduced scale. 
     The broken-line showings of water pipes and shower system are environmental only and form no part of the claimed design.