I bought mine at one of the big stores. The prices are the same everywhere. I went to electrical engineering school so it was easy to install. I have a 150A service in my house. I am converting a gas kitchen to an all electric kitchen and adding an electric car charger. This device lets me know how close I am to the 150A limit and whether or not I need to upgrade my service level to Home. As long as you know how to work with switchboards and understand and respect AC power, installation will be quick and easy. If you are unsure, be sure to hire a licensed electrician.
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