For all the reasons others have already stated, what you want is a Kill A Watt instead of a multimeter or another thing to buy. Plug this thing into the wall and then plug your appliances etc into the meter and leave it for a week. I will record total power draw over the duration so you can see exactly how much power is being used under normal operating conditions. With a little bit of math you can compare kilowatt hours consumed with your power company costs and figure out how much money it cost to use TV’s etc per hour.

https://www.p3international.com/products/p4400.html