I agree that is a good idea. Also, you can use the current part of the meter and see how much current is going to you speakers. So, if you take your voltage and multiply it times your current, you just might get a rough idea of the power that your using (watts). The biggest and most interesting thing you will notice is how LITTLE voltage and current your using compared to what everyone "says" you need. If for example you are using approx 1 or 2 watts, you need headroom of approx 20 times that, or about, 80 watts. See? you don't really need 400 watts per channel with a Klipsch set up. Now if you had speakers with an 86 or 87 DB sensitivity, then you would need a ton of power.
The reason you want 20X your normal listening power is so when you have a spike in the sound (home theater!) your system can deliver what sounds to your ears as a perfect spike in the system. This will happen even though technically that spike could be a 100X spike. You will not hear it as your ears are not as sensitive as an O-scope. So, get out your meter and have fun. Oh and make SURE, DOUBLE SURE you don't let any strands of wire touch across the terminals as you will instatnly blow out your output transistors. It takes about 1/100th of a second and they are gone! Good Luck!!!