Well that's a tough question to answer and keep in mind I've taken my share of shots at Monster. Realistically though, I don't think one should look at the meter in one of those 'power conditioners' as being overly precise. Also, the meters may well be reading the voltage with equipment attached in which case one should rightly expect variations in voltage with equipment attached and playing. Further, that voltage may well take a dip during demanding passages that are being played. The thing is though, that people look at that and have a tendency to panic. My god they may say, the voltage dropped to 113 as I was watching and listening to something from Star Wars or horrors, one's cherished copy of Yentl
You see, that's normal and to be expected. Now companies are a funny lot. There's the truth they tell you and the truth they keep away from you. Kind of like a prosecter's office not disclosing that they found additional blood samples that don't correspond to the defendant. Competent manufacturers of equipment are quite aware that voltages may drop and even upon occasion rise, hence they design their equipment to play entirely satisfactorily within a certain tolerance. However, you invariably won't find Monster or for that matter just about anyone else telling you that's just the way life is and that it's ok if your voltage isn't a rock steady 120 volts. By not properly informing you of that, you, the consumer, are left to wonder...to agonize...and then to consider the purchase of something that while it may not hurt you (except in your wallet) doesn't improve matters one iota. Instead, you've taken a quite expensive aspirin and you didn't even have a headache. Now maybe 100 or 200 dollars isn't much to you. However with a profit margin of perhaps 50% and multiplied by a few hundred thousand people and you're improving the bottom line of whomever. The audio industry as many others is replete with providing solutions to problems you don't have. That's life, huh?