Whats a good economical way to test the electricity on a circuit?

I get what your all saying.. makes sense.. and not sure if im coming off nutty but i am pretty relaxed.. just wanted to play around with some measurements.. especially to see how well these PC, conditioners, etc are working.. Thinking of putting a dedicated line in.. aside from ears.. but just wanted to play around with the idea.. so if i shut off everything.. except breaker line to audio system.. that would get the same results as a dedicated line?

Now that you know your VAC is "Dirty", what you gonna do about it?

I have a good supply, very seldom have outages, very seldom have brownouts, and we haven't had spikes or over voltage for over 30 years.
PG&E went from 8k lines to 20k lines, 35 years ago. A lot of problems went away. Constant Power supplies issues, all around us.

PC especially use to lose their power supplies. One in maybe in 30 years now, from 1 a year. You had to run a PS backup, if you were running a server...

We have smart meters, now too. There is a lot more information there than you might think..

What do you as an owner of expensive equipment, do to protect your gear?

I use something that maintains, the voltage at 120 VAC on the button.
Surge protection, filters above 40 khz, and 20khz. Good copper inlets and outlets on the device. The lowest noise level I can achieve (hum). The quickest response time in the event there is a problem.

There is a few more features, but maintaining the voltage, is one of the best things you can do to increase gear life. Mine cost 300.00 usd or close, and about 6-10 dollars in stuff to quiet the mechanical hum, to practically zip...

Regards

For one.. I never tested anything to see what the condition on my circuitry is.. My neighborhood lucky enough doesnt have any smart meters yet... i know smart meters can go a long distance. But the point is.. if I can test my home... then maybe I can see what is causing my lines to get.. dirty or whatever.. or measure in my house what devices are giving off the most interference, etc.. not sure why finding a cheap meter to get an idea is such a big deal. At the moment im using a Shunyata Hydra 6 conditioner, and a mixture of Shunyata and Silnote Power cords, and a ADD-POWR SYMPHONY PRO EMF Conditioner. They all have made a difference in each step. 

But one thing you mentioned would really help. If I shut off everything in my house.. except the line to my audio system.. would that be comparable to getting a dedicated line? 

Here's what is going on, as best I can understand it. Which is way better than most. No one else here even comes close to having done as much or as many different things to improve power to their system. Challenge! This is only the tip of the iceberg https://systems.audiogon.com/systems/8367 

Every wire is an antenna. Electromagnetic radiation of every kind crosses every wire inducing a signal in that wire. That's the improvement you hear flipping off the breakers, it reduces RFI by cutting off a whole slew of antennas. This is separate from back EMF noise in the line from devices that are connected and running. 

Those two things together are only part of the problem. Another probably even bigger one is transmission efficiency. Our systems do not draw power in a smooth even flow. Its extremely uneven and varies constantly with the music. Just how much this matters is very easily demonstrated by something as simple as swapping out diodes or caps in the power supply. 

Every little connection along the way is a gap the power has to bridge on its way to your system. You think its a solid connection. You think there's no gap. On a microscopic level its craggy as the moon. You think the power flows. On a microscopic level electrons are piling up until there's enough and then zap they jump across the gap. Marketing people call this micro-arcing. Audiophiles just love marketing lingo. You are well on your way to wasting a phenomenal amount of time chasing marketing lingo, measuring and all of that. Monumentally huge waste of time.  

This is why I say to relax. You're all worked up thinking there's something there you can search around and find the answer to. Well there is, and there isn't. There isn't in the sense you cannot find any one thing to point at and say do that and done. There is in the sense you can say its all crap and so anything and everything I can do to make it better is a step in the right direction. Just know its like taking a step here on Earth. You can walk your whole life and never run out of steps. Round and round. Enjoy your walk. Its endless.