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This energy and power monitor does what it says and does it pretty well. I tried two different plug-in meters and this one was by far the best.I didn't bother with any of the devices that are attached to the live cable next to the house's main electricity meter, as these can't measure actual power consumed (i.e. what you're billed for). Only plug-in meters can give you an accurate measure of this, though of course you can't use them to directly measure e.g. showers or cookers as they don't have a plug (with a little effort though, you can use the meter to work out how much energy one revolution of your normal electricity meter corresponds to, which you can then use to measure consumption for items like showers that don't have a plug).The meter is able to measure low currents and low powers fairly well, so low-consumption appliances or devices on standby can be measured accurately (unlike the other meter I tried:  Power & Energy Monitor by Brennenstuhl ). It measures current (A), actual power (W), apparent power (W), power factor, total energy (kWh) and usage time, and you can view any of these values within one or two button presses (some buttons toggle between two measures). The usage time measured doesn't depend on the current drawn by the appliance you're measuring, so for fridges/freezers that switch on and off, you see the total usage time which makes it easy to work out typical (average) power consumed.The meter doesn't have batteries, so you have to read the measurements while it's plugged in. This is rarely a big problem, but occasionally you might have to get under a desk to get to the plug socket and the meter (you can always use an extension lead to help with this).All the measurements are updated about every second, so you can see how power usage varies for things like TVs and PCs. Power values are shown to the nearest Watt, and the meter seems to give reliable readings at the bottom end of the range (1-5W). You can even look at apparent power and the power factor to get an estimated value of actual power that's not rounded up (e.g. apparent power of 3W, power factor 0.5 means actual power is 1.5). Measuring a low-energy light bulb rated at 11W gave an actual power reading of 11W, so it seems to give accurate readings. After measuring all appliances in the house, estimating power usage for the cooker/shower and estimating the amount of time each item is used on average, I got a total figure that matched well with our actual average daily usage. It was then easy to see how energy could be saved by using some appliances more carefully and by cutting down on standby.Overall: a useful tool for measuring the power used by household appliances (when active or on standby), easy to use, accurate measurements of actual power consumed (including low currents/powers). Ideal for identifying the most energy-greedy appliances, and for working out where energy savings can be made.

I bought this on a bit of a whim because I'd always fancied seeing what my PC's draw from the mains.I'm interested in building low-power, energy efficient PC's and wondered if a couple of them are really as economical to run as I'd thought.The unit is fairly basic, as you'd expect from the price. It only operates from mains due to not having a battery but this isn't a problem as I'm only using it once in a blue moon when I add or remove something from a PC. I'm also mainly interested in the power draw in Watts, so no fancy features are needed. I first plugged it into my HTPC and got a fairly unsteady swing between 50 to 65 Watts on idle. Then I tried it on my home server and got a much steadier reading of approximately 12 to 15W. I realised that my HTPC is running from a power brick salvaged from an old laptop, whilst my server is running from a more expensive Meanwell power brick, so it's possibly my choice of components that are causing the HTPC to be slightly erratic on idle. I'm thinking of upgrading the brick on the HTPC to something a bit better.This was a handy device for a part-time enthusiast. It's probably not for someone that wants expert level diagnostics but it's good enough for me. The brief instruction booklet is in English too, which I was pleased with after reading reviews of cheaper products for a few quid less.

I spent like 2 hours testing stuff with this. I love it. Here are some of my outputs://Main PC-SpecificationCorsair ax 850Watt gold PSUASRock Z77 Extreme4 Intel Z773.40 gigahertz Intel Core i5-3570KSAMSUNG SSD 830 Series1TB Western Digital HDD3TB Western Digital HDD3TB Western Digital HDDGigabyte ATI Radeon HD 7870 OC Windforce 3X 2048MB GDDR5 PCI-Express Graphics CardAtheros AR5005G Wireless Network AdapterMouse - Razer DeathAdder 2013 6400 DPIMicrosoft Wired Keyboard 200Cooler Master Hyper 212 EVO AMD Intel Processor CoolerCPU FANs - 2x Scythe Gentle Typhoon 120mm 1850 RPMCoolermaster HAF922 Case with 2x 200mm fans2 x G.Skill 8GB (2x4GB) DDR3 1600Mhz RipjawsX Memory Kit CL9 (9-9-9-24)Test results when checking the Watts used in different scenarioscomputer idle = avg 70Watts, max 95Wattsbf3 = avg 200Watts, max 215Wattsplanetary annihilation avg 190Watts, max 201Wattstf2 = avg 160Watts max 174Wattstf2 & planetary annihilation avg 190Watts max 199Wattscompressing a large file = avg 130WattsSo turns out this machine could probably get away with a 300Watt PSU pretty easily. Suprised me!I wonder how efficient the PSU would be if I did actually get a gold 300 Watt PSU. I will buy one and find out!//Old LCD monitor (Samsung T220 22" Widescreen LCD Monitor)avg around 41 Watts//Cisco 3550turned off 0 Wattsavg around 45 Watts//Freenas serverturned off around 1.5Wattsavg 120watts, max 141Watts//Light in attik (Flourescent)turned off = 0 Wattsturned on = avg 10 Watts//2 desk pc speakersoff = 3.8Wattson = 4.8Watts//Main Monitor (BenQ XL2420T)off = 0 Wattson = 30 Watts//Raspberry Piavg 3.5Watts