Abstract: Scales include at least one transducer, a weighing pan arranged such that weight applied to the weighing pan is referred to the transducer, and electronics which receive an output from the transducer and drive a display to provide a user with a visible indication of the weight applied to the weighing pan. The transducer and electronics are contained in a sealed enclosure defined at least in part by a flexible water-tight membrane which is able to move and thereby (a) to accommodate changes of volume of the sealed enclosure without creating a pressure differential between the interior and the exterior of the sealed enclosure and (b) to accommodate movement of the weighing pan. The water-tight membrane may include a double film comprising a saturated salt solution between two films.