Oh yes, see no harm as long as we admit they are toys, it is when some one thinks if they have a meter viewed with a computer they will use less power, or make better beer.
OK to start with it may help, I would measure the s.g. every day when I started, but got to realise it was same patten every brew, same charging car battery, and others, some times you do have a surprise, sky box monitors the electronic program guide and if timing moved for program you want to record it auto adjusts record time, as a result it does not use one watt on stand-by but more like 15 watt to power LNB. But 15 watt is nothing really.