20+4 Pin LCD Computer Power Supply Tester for SATA IDE HDD ATX ITX BYI Connectors-Black

This is actually a very good power supply tester unit. The key to getting the most out of it depends on a users understanding of it, which I will be explaining in this review.Find a place where you can set it up to hook up your connectors both the 20/24 pin and the 8 pin connector and leave it there still, while you turn your PSU's on and off switch. I mention this because holding it or moving around the power supply tester will give you incorrect readings.Next, something else that I haven't seen mentioned in the reviews is you turn off your PSU and then hook up your next connector, whether it be the SATA, Molex, 4-6-8 pin connectors, etc. The connectors weren't meant to be "hot-swapped" so always turn your power supply tester off before going to your next plug.The PG rating means "power good" and it needs to be between 100 ms to 500 ms. If you are getting a 0 ms, that particular plug is dead and you can't use it anymore.The LL value means the voltage is too low and HH means the value is too high. You'll also get a buzzing sound with either a PG - 0 ms, LL, HH rating, so pay attention. This indicates the voltage is out of tolerance for a peripheral and you aren't getting any power at all, aren't getting enough voltage or are getting too much and could be frying your equipment, respectively.The tolerance range is ideally +/-5% (+/-10% for the -12v rail) of what the voltage is supposed to be giving, but here are the max ranges I've found, so if your number isn't in this range you now know what to do with your PSU.+12v - 12.5v+5v - 5.3v+3.3v - 3.5v-12v - 13.2vYou can indeed test this unit under a load, but you have to take a paper clip and you'll need to connect it to your main 20/24 pin connector. Connect as many peripherals as you can and look for the PWR_ON green wire on the 20/24 pin connector and connect one end of a paper clip here and the other to a black ground wire. This starts the PSU with everything running.That's it, folks, a review that clearly explains how to use this tester.Have a good day.

I used it to determine that a power supply was out of spec. It is pretty straight forward to use. I would suggest also testing the supply under load. Using a 24-pin splitter cable helps with the load testing.The voltage reading are a little different from what a multimeter reads but it is close enough. It would be nice if it had a little bit more voltage resolution, but probably close enough for a tester.

Works, but cheap construction. What can you expect for the price?

This is a nice little device and it works as advertised. Used it to check out a Corsair CX430M, 24pin and CPU 4 pin connectors. The case appears to be aluminum, the plastic connectors are solid, the LED digits and lights were clear, no issues what so ever. It works off the external power of your PSU, no batteries required. For the money it's a good deal and perfect for quick measurements. It beeps if the power it expects to see isn't there or out of spec. No on or off switches, if your not connecting the 20/24 connector, you have to jump out two pins using the paper clip trick or the PSU won't turn on.

Very Useful

The package insert provides minimal instructions but the tester is fall-down easy to figure out and use because the power supply to be tested can be plugged into the corresponding jacks only one way. The test is automatic, fast, and the results are easy to understand. The tester instantly revealed that the power supply on a dead computer was providing variable 11.2-11.6 volts instead of 12 volts steady. On boot the computer would jump to FF (fully functional) on the post code except that nothing functioned. The computer stumped a repairman who returned the computer unrepaired after two weeks. A new PSU is on order and if the motherboard has not been ruined during all the troubleshooting while trying to guess the problem then perhaps I will recover the computer. For the low price this tester should be in the toolbox of anyone trying to fix or build a computer.

Did the job I wanted it to do to test my psu, the product feels high quality except that the sides of the unit have unpolished metal edges that easily slice skin and my thumb open. This is definitely an issue especially if you're trying to get tight fitting connectors into the unit in a tight spot. Not a huge deal but considering the body was polished everywhere else except for those edges it seemed a little strange and they probably should have just used plastic. I'd still get it but just be careful.

One out of a machine that stopped working. And replacement for that machine. But, machine wouldn't turn on with new PSU. I figured board died. Now... I was putting together a good retro pc. Some of the parts are expensive. With a total cost around $2K, I didn't want to risk throwing in a bad PSU and frying it. This tester showed everything with newer PSU as good. The OLD PSU, showed all the voltages, but had an "error" and the voltages fluctuated slightly. The newer PSU was rock solid. Threw the newer PSU into it and powered right up. Yippie. Saved me from buying another PSU.