Plug Power Meter Energy Electricity Usage Monitor Energy Cost Monitor Watt Voltage Amps Meter Multi Tester, Control and Reduce Your Energy Costs

It's good. It works once you figure it out. SURELY there is someone in China they could have hired to translate the instructions into English!! They'll drive you nuts.Pro: Good price. It works with same data as more expensive units. Holds the readings when you unplug it.Not quite a Con: 1. If plug was 1/4" lower, the other outlet on your wall plate would be easily accessible. A flat lamp-type plug will fit, but nothing else. 2. The screen you enter your cost/KWH on doesn't do much else; your total cost shows up on the Watts screen. It says Cost though.Con: 1. REALLY needs a back light of some sort. A higher contrast display might help, but that is not adjustable. I use a flashlight. 2. Instructions say it reads in Euros. (Why would Chinese use Euros??) Actually, it reads in decimals, so it really doesn't matter what currency you use. 3. Needs to allow input to .000 instead of .00 in currency. E.g., my cost per KWH is .1271; I can only input .12 or .13 (rounded up). Not a big deal, but over an extended period it's off a bit. 4. Instructions are so lost in pigeon-English, the best you get is some idea of what they are talking about. Then you are on your own.This really let me know that things like my network UPS backup is only costing $ .20 a day; my router is only $.04 a day. I'm happy.Contrary to other complaints that it rolls over every 10 hours, mine goes to 23:59 hours and adds days.The instructions would have you believe that the timer (restarts if you unplug it to read it and replug it. DON'T do that!) reads minutes and seconds until it reaches an hour, then reads hours and minutes. It is only at 00:00 display rather than HH:MM:SS.The fact is that mine reads seconds through 59. Then it rolls to minutes:seconds, but the seconds no longer increment. So you then only see minutes and :00. The minutes then increment until you reach an hour. At THAT point you now read HH:MM.That is not a problem so long as you know what is going on.I docked one star for lack of back light and worthless instructions.

I purchased this item since it looked to be easy to use, had the features I wanted and was priced right. I used it to find out about power consumption of 120V appliances, the most important being the refrigerator. It worked great. It is easy to use. I used all the features with the exception of the cost feature. With the cost feature you can program in the cost of a kilowatt hour and it will calculate how much money you spend to run the tested appliance. The only downside to the whole thing is the instruction sheet could have been a little better written.

It appears to measure accurately, and the display is pretty good. As others have stated, the manual is pretty awful, and setting the cost per kilowatt hour is a pain, so I'm deducting one star for poor interface/controls.The other issue is that after three years of ownership, the battery died and wouldn't recharge. When the battery dies, the display is very faint or doesn't work at all, despite being connected to AC wall power. It's a 3.6V 20mAh three-cell rechargeable soldered onto the board. In the attached photo, I've desoldered it with some difficulty (taking care to discharge the capacitors first), and the display is sharp and high contrast now. No battery backup, though. So minus one star for a battery design that prevents the display from working if it gets discharged too low.(For reference, the battery greedily jumped up to 10V when I briefly put it on a peak charger - at least one of the NiMH cells must have discharged enough that it's shorted and can't be charged anymore).

The instructions look like they were translated by someone who doesn't understand English. They are horrible. When the cost per kilowatt is entered, and the meter is run to calculate the cost of electricity to the attached device, there is no way to reset the counter without having to re enter the cost per kilowatt again. The whole device has to be reset, just to reset the clock/counter to use on a new device. The display is somewhat dim. So if it is looked at at an angle with average room lighting, it's hard to see. I chose this model over the other popular unit because it calculates the cost of electricity. It does work, it just could have been a little more refined and been a great product.

The 2 Weanas that I bought work OK.... I guess. The instructions are really bad...very difficult to understand. To install the battery, you have to remove 3 screws and carefully open the unit. When you get the unit open there is no place to install the battery and no instructions on how to do it. A battery that comes close to providing the correct voltage service is a cell phone battery that costs $18 at Radio Shack. I suppose that if you never have a power outage your information would be stored properly...... Awful product...... Not Amazon's fault. On an up note, Amazon did a fantastic of shipping of shipping these products on time.......wow. I'll be buying much more from Amazon.

Screen is kinda dim and hard to see unless directly in front. That's not always possible when needed in cramped tangled spaces. Seems to record correct values. My first use of such device. Glad it was available and reasonably priced. No seller contact.