Nowadays TV ads show use of a small hand-held instrument which is supposed to immediately indicate the extent of 'germs' in ones mouth/toilet bowl/skin etc. Is anybody aware if there is really such an instrument available? I know this is just a gimmick used by clever advertisers to fool people that their product (toothpaste/toilet cleaner/soap etc.) should be used to remove such 'germs'. No such instrument for instant measurement of 'germs' has been invented so far, to the best of my knowledge but any input on this from Q & A members is welcome. Thanks.