I've had this monitor for a couple weeks now and it's working flawlesly, reading the optical port on top of my meter. I got it for $30 incl shipping on ebay. In combination with a kill-a-watt it's a good tool to see where your energy is going. I like it a lot to evaluate anything that is not plugged into an accessible socket (water tank, baseboards, heat pum, dish washer) as well as go get a general whole house instantaneous usage view and a convinient way to see daily usage without having to walk to the meter.
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