When thinking about a waterproof hair trimmer many people imagine something more like a razor with a replaceable blade. They never imagine that an electric hair trimmer could possibly be classed as being waterproof. Probably this thinking comes from what we are taught about "water and electric don't mix". Nothing wrong with the advice at all, but there are numerous occasions that we use water and electricity at the same time, such as boiling water in a kettle, on the cooker and in washing machines.
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