Filling the bath's not exactly rocket science, but then, given the number of times I've allowed it to overflow while I've been off doing something else, I guess I'm not best qualified to comment. This LCD alarm aims to stop that sinking (or flooding, rather) feeling by using a sensor to tell you when your bath's about to overflow. The LCD readout will also tell you the temperature of your bathwater, so you don't have to do the "standing on one leg then the other" dance either. Or is that just me, too?
Related: The Bodyflik dispenses with those archaic bath towels | Sok Chromatherapy Bath | Massaging bath pillow
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Not rocket science but i always get it wrong, cool and useful product. Thanks for mentioning it...