With the addition of a rubber seal over the front pushbutton, our timers can operate submerged.  The video shows the timer operating at the bottom of a chemical drum  (70cm water depth) for over an hour.

This level of waterproofing is not generally needed for the thousands of timers we have successfully operating in the plating industry and elsewhere, but in certain situations increased waterproofing can be useful.  One case is when surfactants are used.  Surfactants are of course designed to wet surfaces and this can cause the liquid to creep into cracks that water can’t.  This occurs in the dairy industry for teat prep dip.  More information on waterproofing on this page.