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1Pcs 20/24 Pin LCD Computer PC Power Supply Tester for ATX BTX ITX TFX SATA with Buzzer Automatic Alarm
Comidox

1Pcs 20/24 Pin LCD Computer PC Power Supply Tester for ATX BTX ITX TFX SATA with Buzzer Automatic Alarm

Bottom line: The Comidox 1Pcs 20/24 Pin LCD Computer PC Power Supply Tester ($11.99 on Amazon as of 2026-10-07): LCD shows each rail (3.3V/5V/12V/-12V/5VSB) to +/-0.01V accuracy; main trade-off: alarms and shows 'LL' unless the 4-pin P4 connector is also plugged in.

$11.99

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Buy on Amazon — $11.99 Compare to similar power supplies

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides.

*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ LCD shows each rail (3.3V/5V/12V/-12V/5VSB) to +/-0.01V accuracy
  • ✓ Buzzer alarm sounds and the value flashes when a rail is out of spec
  • ✓ One 20/24-pin tester covers ATX, BTX, ITX and TFX supplies
  • ✓ Reads PG (power-good) plus P4/P6/P8/SATA/IDE and PCIe 6-pin outputs

Cons

  • ✗ Alarms and shows 'LL' unless the 4-pin P4 connector is also plugged in
  • ✗ External SATA/IDE/P6/P8 lines only light an LED, no LCD voltage shown
  • ✗ Only the 20/24-pin main connector drives the LCD voltage readout
  • ✗ Reads idle rail voltages, not performance under a real load

Manufacturer description

Specifications:Material: plastic + aluminum alloySize: 126x64x18.5mm/4.95x2.51x0.72inchWeight: 120gOperation method:A. Plug the power supply 20PIN or 24PIN and P4, P6 or P8 into the corresponding position of the power tester. (If you plug in the 20PIN or 24PIN interface tester alarm and display LL, you need to plug in 4P! Please look for 4P must be inserted in the 4P position!)B. Turn on the power and “drip” sounds two sounds. If the values of each group are not flashing, it means that the power input is normal.C. If a circuit voltage signal is not detected (such as a 20PIN or 24PIN…

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SpecPicks Verdict

SpecPicks scored Comidox 1Pcs 20/24 Pin LCD Computer PC Power Supply Tester using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. Comidox's power supplies lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • The LCD power tester is a powerful power test device. This power tester only needs to be connected to the ATX connector of the power supply to easily and intuitively know whether the output of each power supply is normal. It can detect ATX, BTX, ITX, TFX computer power supply, and can display various voltage and PG values in liquid crystal to quickly detect the performance of computer power supply.
  • The LCD displays various parameters such as output voltage and PG. When each parameter exceeds the normal value, the buzzer will sound a warning and the corresponding value will flash.
  • It can measure the voltage of each group of power supply 3.3V/+5V/+12V/-12V/SB+5V/PG, and also measure the output wire P4/P6/P8/SATA/IDE, external DIE/SATA/P6/P8 is the light Displayed, there is no LCD voltage. Only the 24pin or 20pin will have the LCD voltage.
  • It has LCD intuitive and accurate display voltage (+/-0.01V), automatic fault alarm, complete test interface, small and beautiful appearance, and many test functions. It is the best choice for quickly detecting PC power.
  • Support 20Pin, 24Pin ATX interface / SATA interface / 4Pin, 8Pin interface / PCI-E graphics card 6Pin interface / floppy drive interface / ATE hard disk interface.

Full Specifications

BrandComidox
ColorBlack
StyleCompact
Style NameCompact
Unit Count1 Count
Part NumberCP218
Power SourceCorded Electric
CompatibilityPC
Measurement TypeVoltmeter
Compatible DevicesPersonal Computer

Ready to buy?

1Pcs 20/24 Pin LCD Computer PC Power Supply Tester for ATX BTX ITX TFX SATA with Buzzer Automatic Alarm is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $11.99

*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.

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1Pcs 20/24 Pin LCD Computer PC Power Supply Tester for ATX BTX ITX TFX SATA with Buzzer Automatic Alarm
$11.99
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