Good find. I have two of these meters and use them to monitor the electrical usage of many appliances in my home.
Tip:
Put the meter on your refrigerator and get a Kwh usage for one day. Record the number, then clean out the bottom intake grills and back of the fridge real good. Get all the dust out! Wait a day and look at your lower Kwh usage!
Here is a review I wrote on the product a few years ago:
P3 International P4400 Kill A Watt meter review