I'm trying to work out how I can monitor our energy usage at home in real time. We don't have a smart meter and due to our location we are unable to get one. I'm sure I've seen a gadget that connects to your meter then displays the data on a small screen but I can't seem to find one. The only ones I can find are all individual monitors that you can plug just one appliance into which is not what I want! What do I need?! (That's not going to cost the earth!) Thanks