Stanley 77-028 Energy Meter EM100 for $17.90

The Stanley 77-028 Energy Meter EM100 measures how much power a household device consumes--whether it's in active or sleep mode. The meter will calculate the amount of energy the device will use per day, month, or year, so you can compare its readings with U.S. Department of Energy ranges and make an informed decision about which items should be upgraded, unplugged, or removed from your home.