Quoted from HighVoltage:Also, anyone have thoughts on how to load test a circuit? It looks like you can buy some testers for $150-$200. I wonder if a tool rental place has these. Any other ideas? Line up some space heaters maybe...
I have one of these: https://www.amazon.com/P3-P4400-Electricity-Usage-Monitor/dp/B00009MDBU
It is $18 for the older model, it tells you how many amps 1 outlet is using. You could plug multiple pins into it by using a power strip. It will give you wall voltage and amp draw.
Good luck. I agree with others when they suggest getting an electrician to add more circuits. It is what I had done.
Best regards,
Tom