Instruction: Generate an answer to the question by utilizing the information contained in the document.

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Question: Does this tester put a load on the PSU or does it solely display voltages?
Document: Great product! I only wish it could test the PSU under load, not only the voltages. I'll be using this a lot!
Had my whole IT kit stolen from my car and had to replace everything including my PSU tester. I had a basic one that did the job but wanted something with more detail and I like Thermaltake so decided to give it a try. Works great- is nice to see actual voltages etc. Unit has nice fit and finish and seems well made.
Sounded warnings on a known good power supply. Doesn't detect failures under load. Hit or miss on positive detection. It might give you a heads up if the power supply is bad by fluctuating voltages but it's not a definite bad or good result.
Works great for testing suspect PSUs computers. Blue display shows all the relevant voltages on the different rails. Great feature: the display changes from blue to a lurid red color if one of the voltages goes out of kilter. Great for those PSUs that have to run for awhile before the voltages start going out of spec.
The nice thing about the LCD is that it shows you the voltage reading as well as what it should be right next to it. Easy identification of what you are looking at/testing.The only concern I have is that I don't think this particular tester puts the power supply under load. I think this could be an important test. And of course this won't tell you if your power supply is overloaded - you should be able to figure that out on your own.
This tester probably doesn't draw enough of a load to adequately test the power supply under real-world conditions.I expect (but I don't know for sure) that most other power supply testers would have behaved exactly the same way. I advise taking the money you're going to spend on this device and putting it towards a new power supply.
I repair PCs for a living and this is the best tool I have found for testing power supplies. This tester gives both an audible and visual indication of the power supply status. If the supply is good the backlight is blue and if the supply is bad the backlight is red and the tester beeps.This tester also shows all critical voltages to 0.1 volt accuracy. A must for every PC tech's toolbox.
I bought this power supply tester to replace an old junky one that I had. I am very pleased with this tester so far. I have tested about 10 power supplies with this tester and it has not given me any trouble so far.Pros:+ Large display+ Backlight changes color to reflect if the power supply passes or fails+ Easy to read voltagesCons:- None so farI'm trying to convince my boss to get one or two of these at work.
Alas, I assumed that the PSU was so out of whack that no tester could handle it, but just in case it was the tester's fault, I decided to buy another tester, the Thermaltake Dr. Power II.
I do a fair amount of computer building and trouble shooting and the need for an easy to use PSU tester is a necessity. This Thermaltake unit fits the bill and gives a read out of all the PSU connections in a couple of minutes. No extra cords are needed as it runs off the PSU main power plug.
Answer: It doesn't put a load on the device. If you want a load, you can leave the rest of the devices connected so that you're only missing the mobo, but of course, that would be like testing water with your big toe; nowadays the mobo and graphics cards are the main power draw on the system. Therefore, the only true test is to plug in a known good psu and check out the system performance. I'm assuming you bought this device to test more than just your own psu, so you're probably a computer tech and you'd have other psu's available. This is what you'd do if your graphics card was suspect -- replace it with a known good card.