The reason I say 'median weight' is because you can gain or lose as many as 5 pounds a day just in water weight, depending on how much you drink, how hard you work, and even just how dry the environment around you is. It's impossible to properly control. So weigh yourself 3 times a day for a few days, and get the median of those weights. This will give you a figure that is reasonably close to your 'true' weight by only using a common scale. Any changes of more than a few pounds are going to almost certainly indicate muscle or fat growth - in your case, I'd say it's a safe guess that most of the difference would be muscle.
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While most protein shakes are just sold as this, this one was intensively tested and then published in the Medicine & Science in Sports & Exercise journal, which is pretty impressive. There was a twelve week study conducted by a third party at a university. They took 22 different unique people and put them into 3 groups, a placebo, control, and one that took the Anabolic Halo. The results were surprisingly very dramatic those taking the Anabolic Halo Hardcore Pro Series put on a total of 7 pounds of muscle while those in the placebo group only gained 1 pound of muscle. Their leg presses were also significantly more weight 375 lbs while the placebo group was only able to press 193 on average.