Welcome to the store! 1. High-quality computer power supply tester with a long service life. 2. Simply connect this power tester to the ATX connector and you'll know if the power outlet is normal. 3. The tester can check the voltage of all wires to ensure the power supply is working correctly. 4. Easy to use, just plug in the connector and the LED indicator will light up to show which pins are powered. 5. Can help you quickly diagnose or troubleshoot power problems, a must-have for any computer technician. Item Type: Power Source Tester Color: Black Material: ABS Instructions: 1. Turn on the power supply to be tested; 2. Insert the 24P (20P) connector of the power supply to be tested into the corresponding 24P (20P) socket on the power tester; 3. Check if the 7 indicators on the right (+3.3, -12v, PG, +5VSB, +12V, -5v, +5V) are lit; 4. Insert the HDD connector of the power supply to be tested into the HDD socket of the power tester and check if the 2 indicators (+12, +5V) on the left are lit; 5. Unplug the HDD connector from the power tester, then insert the P4 (P6/P8) connector into the corresponding P4 (P6/P8) socket to check if the left light (+12V) is lit; 6. Unplug the P4 (P6/P8) connector from the power tester, then insert the FLOPPY disk connector into the corresponding FLOPPY socket and check if the two indicators (+12V, +5V) on the left are lit; 7. Unplug the FLOPPY connector from the power tester and insert it into the corresponding SATA socket of the SATA connector. Then check if the 3 indicators on the left (+12V, +3.3v, and +5V) are lit. 1 x Power Source Tester 1 x User Manual (on packaging surface) Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!