Patent ID: 7523952

Claim:
A gauge to determine the depth of a trailer within a body of water, the gauge comprising: a hollow tubular housing having an open bottom and a top that has a transparent section; a first light disposed within the housing and visible through the transparent section; a first switch electrically connected to the first light such that depression of the first switch causes the first light to illuminate; a second light disposed within the housing and visible through the transparent section; a second switch electrically connected to the second light such that depression of the second switch causes the second light to illuminate; a float disposed within an internal chamber of the housing and capable of sliding therein; a plunger disposed within the internal chamber of the housing and attached to the float via a rod such that the plunger is closer to the top and the float is closer to the bottom; and wherein the housing is adapted to be attached to a rear portion of the trailer such that the top is facing skywardly and such that as the trailer is lowered into the body of water, the water enters the housing through the bottom causing the float and the attached plunger to rise within the internal chamber, the float first depressing the first switch and with subsequent rise of the plunger, the plunger undepressing the first switch and immediately depressing the second switch.