This little meter will help you to work out which devices and appliances in your home or office are using most energy, and so help you calculate and reduce your carbon footprint. Simply plug your devices into it (and it into the wall) and a clear and accurate reading will show you the energy being consumed by individual appliances, and their cost.

Take readings over a week for each appliance in turn and you can see the pattern of energy use for each one - which will help you to figure out how and where to cut your carbon footprint.

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