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This is the newest model of electricity meter from Kill A Watt (P3 International), but it is slightly more expensive than the older version.
The revised version has the capability to forecast power cost for the week, month, and even a yearly basis. As with the older model, it has a built-in backup of saved and accumulated information for review and averaging calculations. It is accurate within 0.2%.
The power usage monitor also monitors line voltage, line frequency, and power factor to help detect voltage drop and brownout conditions before they can cause damage to your equipment.
The meter is set up to handle a max 15 amp current (so about 1875 watts), so make sure you don’t connect more than one mining rig at a time downstream of this. There are many people who have tried using it to monitor things upwards of 1200 or 1300 watts and they have melted this meter… as with everything in life, use your brain and be safe!