Water-in-oil tester
FIG. 1 is a front perspective view of a water-in-oil tester showing my new design; 
     FIG. 2 is a top plan view thereof; 
     FIG. 3 is a bottom plan view thereof; 
     FIG. 4 is a left side elevational view thereof; and 
     FIG. 5 is a right side elevational view thereof.