Top positive review
One person found this helpful
Not perfect, but very convenient and a good investment in saving electrical use.
on June 7, 2017
This handy device has provided me with helpful information on small appliance operating costs. The voltage testing function does read a little high on my Kill-A-Watt meter. When it said that my house voltage was 140V, I asked an electrical engineer family member to do a side-by-side test it with his better voltmeter. His read the expected 122V for house current, so the Kill-a-Watt meter reads 15% high on voltage and probably also wattage. That's still within an acceptable range of error for estimating operating costs, so I'm OK with that error for such an inexpensive device. One appliance that I thought might cost a lot to run used only 0.7 kwh over a 12 hr operating cycle - less than a dime a day. In contrast, some big lights used over a dollar a day of electricity until I converted them to LED. Good investment.