Other than the obvious fact that the ECM-1240 can monitor many more loads, there is a fundamental difference between these low-cost products and our ECM-1240. The information provided by these products are falsely termed kilowatt-hour or will use the vague term “electricity use”. Feel free to contact the company and ask them if their monitor measures “true” power. True power is what you buy from the power company. Typically these low-cost devices provide an approximate “apparent power” which is solely based on the amount of current used. This can easily cause errors in energy readings greater than 50% depending on the type of load monitored.
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