Watt Meter, Plug-in Socket Power Meter, Auto Cost Calculator, Backlit Large Display, Overload Protection, Kilowatt Wattage Voltage AMP Tester, Electricity Usage Electrical Energy Monitor

I purchased this mostly for fun-- and it was priced at a point that this is a reasonable use case. That being said, it seems to produce useful measurements and I will press it into service to analyze my household power use. I didn't rate its accuracy, lacking a calibration standard, but the measurements reported seem to be credible. I suspect it could be wholly relied upon for comparative assessment of power use. Absolute calibration is uncertain. Highly recommended-- apparently useful functionality for a very low price.

I became president of a small fellowship and was looking for ways to cut waste. This tool helped me identify old, energy guzzling equipment that could be thrown out and would save us thousands of dollars. People just don't want to get rid of old "free" stuff that really isn't free because they aren't energy efficient. It doesn't fill all plugs, but most.

I used this to determine loads for sizing a backup generator. Works fine for running loads but the sample rate is only every few seconds, so not very useful for capturing start-up loads. There is a peak function that records/saves the highest load, but if it's not sampling when the peak hits, you won't get an accurate reading. That said it was good enough for my use and much less expensive that other (probably more accurate) options.

This worked like a charm. Helped me hook up a Generlink system to my home for power outages. I knew what each item drew from my generator and was able to run what I needed in a power outage because of it. Great purchase. Only drawback...it’s not backlit. You have to strain to see the display or have it in a brightly lit area. Other than that...a great product.

We purchased a bed warmer for our older cat. Since it's on all the time (whether there's a cat there or not) I really wanted to know how much I was $pending on it. This meter was easy to set so after a week, then after 30 days, and again after 60 days I could see just what it was costing me. It's a great device, and I plan on using it with other devices - like to check to see how much TV's and other things that are plugged in but rarely used actually cost to leave plugged in.

Still use this and it’s lasted forever. Highly recommend!

Got this to check power use of appliances so I could calculate how many things my emergency generator can run. First: The included instructions are about 85% indecipherable--maybe 95%. Four or five times through them and I'm getting a hint at what's being said. I don't think I can get anything more. Translated from a foreign language (Chinese?): missing words, wrong words, repeated words, wrong meaning, missing punctuation. And very poor structure for the layout of the instructions, including no graphics to help understand what they are trying to say or show how the device works. For instance: I want to measure power draw for a number of different appliances (freezer, refrigerator, microwave, small AC unit, garage door opener). I plugged in my freezer and the device is reading the freezer wattage. Great. But if I want to check another appliance, do I need to clear everything using the Reset button? Or does the device begin reading the usage of the new appliance? No idea. The internal battery holds the last settings, but I don't know if they automatically reset when a different appliance is plugged in or not. Therefore, learning how to use this has got to be by experimentation. If you know little about electricity (amperage, volts, starting and running watts), better get a meter with much better directions. Second: Overall, the device does seem to work. And it's fairly cheap. Third: Sturdy & solid. Doesn't feel cheaply made (but I don't know how accurate it is). LCD is easy to read. Buttons are good. Final: I can't understand why a manufacturer goes to the trouble of making a device like this, and then fail to hire a capable translator to write the instructions.

It must be good because i lent it to a friend and they haven't returned it! It would be nice if the screen was easier to read, but it gets the job done.