Computer PC Power Supply Tester, ATX/ITX/IDE/HDD/SATA/BYI Connectors Power Supply Tester, 1.8'' LCD Screen (Aluminum Alloy Enclosure)
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AI Verdict
This aluminum block instantly tells you if your PC power supply is dead by reading rail voltages on a 1.8-inch LCD, making it a toolbox essential for builders.
If you build PCs frequently or buy used parts, this tester pays for itself by instantly ruling out a dead PSU. It falls short for high-end modern rigs because it lacks an 8-pin PCI-e slot and can't simulate a heavy wattage load.
If you need to test power delivery under actual gaming conditions, you need a digital multimeter and a software logging tool like HWiNFO64, or a dedicated load tester.
Regret Score™
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Pros
- Powered directly by the 20/24-pin ATX cable so you never have to hunt for AA batteries
- 1.8-inch LCD gives exact voltage readouts for +3.3V, +5V, and +12V instead of just vague green lights
- Aluminum alloy enclosure survives drops and rough handling better than cheap plastic alternatives
- Loud continuous beep alarm instantly alerts you if a voltage rail drops below ATX spec or is missing
- Tests legacy Molex (IDE) and Floppy connectors alongside modern SATA cables
Cons
- Physically cannot plug in or test PCI-e 8-pin GPU cables, only 6-pin
- Does not apply a load to the power supply, so it misses voltage droop issues that only happen during heavy gaming
- SATA, Molex, and Floppy voltages only trigger basic LED lights, not the LCD screen readouts
- Plugging cables in while the PSU is switched on (hot-plugging) can short out and smoke the tester
Dimension Scores
Reads voltages accurately to the tenth of a volt on the 1.8-inch LCD, but lacks load testing capabilities.
The fault alarm is an incredibly loud, piercing beep that you cannot mute.
The aluminum alloy shell is rigid and feels much more premium than the standard plastic testers.
Ports are crammed close together, making it slightly annoying to plug in thick, stiff 24-pin cables.
Best For
- Diagnosing a PC that randomly shuts down or refuses to POST by checking the PG (Power Good) delay value
- Flipping used PC parts and needing to verify a thrift store power supply works before selling it
- Checking custom-sleeved PSU cables to ensure the pinout is correct before frying a motherboard
Not Recommended For
- Testing modern 12VHPWR or PCI-e 8-pin graphics card cables
- Diagnosing power supplies that only fail under heavy gaming loads
- Testing proprietary laptop power bricks or server PSUs
Watch Out For
- The screen looks heavily scratched out of the box — you have to peel off a very stubborn, nearly invisible protective film.
- It doesn't test under load. A failing PSU might show perfect 12V numbers on this tester but still crash your PC when your GPU pulls 300 watts.
- If you plug in a 4-wire SATA cable, the 3.3V LED will stay dark and make you think the cable is broken. It only lights up for 5-wire SATA cables.
- Do not hot-plug cables. If you plug a SATA or Molex cable into the tester while the power supply is switched on, it can smoke the tester.
Full Specifications
| ASIN | B076CLNPPK |
| Brand | Fuhengli |
| Wattage | 500 watts |
| Form Factor | ATX |
| Item Weight | 3.1 ounces |
| Manufacturer | Fuhengli |
| Connector Type | atx,eps,floppy,pci-e,sata |
| Cooling Method | Air |
| Output Wattage | 500 Watts |
| Item model number | PC - PSU Tester |
| Compatible Devices | Personal Computer |
| Product Dimensions | 4.9 x 2.6 x 0.63 inches |
| Maximum Input Voltage | 250 Volts (AC) |
| Item dimensions L x W x H | 4.9 x 2.6 x 0.63 inches |
| Is Discontinued By Manufacturer | No |
What Buyers Say
The loudest complaint about this tester is actually a misunderstanding: buyers constantly think the screen is ruined, but it's just a tightly applied screen protector. Beyond that, PC builders rely heavily on this aluminum block to quickly rule out dead PSUs during troubleshooting. The 1.8-inch LCD gives exact voltage numbers rather than just 'good/bad' lights, which helps spot a failing 5V rail. The biggest frustration is the lack of an 8-pin PCI-e port, which feels outdated for modern gaming rigs.
“Thought I got a used piece of junk because the screen was scratched to hell, but after I peeled the invisible film off it looks great and instantly proved my Corsair PSU was dead.”
Common Praise
- 1.8-inch LCD provides exact decimal readouts for the 12V, 5V, and 3.3V rails
- Aluminum casing feels substantial and survives being tossed into tool bags
- Instantly identifies dead pins on custom-sleeved cables before they can fry components
- Loud beep alarm makes it impossible to miss a voltage fault
Common Complaints
- Missing an 8-pin PCI-e slot, forcing users to rely on the 6-pin for GPU cable testing
- Peripheral cables like SATA and Molex only get basic LED lights instead of LCD readouts
- Instructions are poorly translated and vague
- Beep alarm is ear-piercingly loud and triggers if you forget to plug in the 4-pin CPU cable
Ownership Tips
- The PG (Power Good) value should read between 100ms and 500ms; anything outside that means the PSU is failing.
- You have to plug the 24-pin cable in first, or the device won't turn on at all.
- The aluminum edges are slightly sharp, so be careful when yanking out stubborn 24-pin connectors.
- Keep it away from live power when plugging things in — hot-plugging a Molex cable will let the magic smoke out.
Frequently Asked Questions
Will this test my 8-pin PCI-e graphics card cable?
No. The physical slot only accepts 6-pin PCI-e cables. You can test 8-pin EPS (CPU) cables, but not 8-pin GPU cables.
Why is the screen completely blank when I plug it in?
The tester gets its power entirely from the 20-pin or 24-pin ATX motherboard cable. You must plug that in first before testing any other cables.
Why is my tester beeping continuously and flashing 'LL'?
This means a voltage is missing or dangerously low. If you only plugged in the 20-pin cable, you also need to plug in the 4-pin/8-pin CPU cable to stop the alarm.
Does this test laptop chargers?
No. This is strictly for internal desktop PC power supplies with standard ATX, ITX, or Molex/SATA connectors.
Why does the screen look like it was dragged across gravel?
There is a factory protective film applied to the 1.8-inch LCD. It sits very flush with the bezel, so you need to pick at the corner with a fingernail to peel it off.
Can I test my custom sleeved cables with this?
Yes. Many PC builders use this exact tool to verify their custom pinouts are correct before plugging them into a motherboard.
Buying Guide
You need this if you build PCs, buy used parts, or make custom cables. It tells you exactly what voltage your power supply is pushing to your motherboard and peripherals at idle. It will not tell you if your power supply crashes under a heavy gaming load, because it doesn't draw any actual wattage. Always plug your thick 24-pin motherboard cable in first to power the tester, then plug in your CPU or SATA cables to check them.
1.8-inch LCD Screen
Instead of a green light that just says 'working', this shows you if your 12V rail is actually pushing a dangerously low 11.2V.
PG (Power Good) Value
This is the delay time it takes for the power supply to stabilize before telling the motherboard to boot. If this number flashes, your PC will randomly fail to turn on.
No Load Testing
This tester only checks the power supply while it's resting. It's like revving a car engine in neutral — it sounds fine, but might still stall when you put it in gear.
Alternatives
If you need to test modern 8-pin or 12VHPWR graphics card cables, look for a newer ATX 3.0 compatible tester. If you need to test under load, you'll need a digital multimeter and a paperclip.
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