Description
The USB S.O.S. Passmark short circuit tester allows you to test USB ports for short circuits, over & under voltage to identify defective USB sockets and to protect USB devices from damage.
Features
- Fastest and easiest ways to check terminal voltage and short circuit in USB ports and USB chargers.
- Test overvoltage or undervoltage on the VBUS
- Check for a short between VBUS and one of the data lines
- Detect invalid voltage on data lines

Protect your USB devices
Protect your expensive USB devices by first connecting the PassMark USB SOS device to detect bad connections that would otherwise cause damage. The PassMark USB SOS device itself is nearly indestructible to test USB ports with protection up to +-100V. The large PASS sign turns green when all voltages are within specification.
Diagnose dangerous bad ports
Seven individual red LEDs indicate errors (beyond the specified voltages):
VBUS | D+ | D- | RX+ |
RX- | TX+ | TX- |
|

Compact design
The PassMark USB SOS Short Circuit Tester is the perfect addition to an essential PC repair kit.
Technical Data
Device Specification | ![]() S.O.S. Short Curcuit Tester |
---|---|
Product Code | PM119 |
Fault Detection | Over Voltage on VBUS, Under Voltage on VBUS, Short circuit between VBUS and any of the data lines, Invalid voltage on data lines |
Pass Indicator | 1x Green "PASS" sign, Illuminates when all voltages are within the specification |
Failure Indicators | 7x Red LEDs for indicating a bad voltage on VBUS, D+, D-, SSRX+, SSRX-, SSTX+, SSTX- VBUS Red LED turns on if: 5.5V < VBUS < 7.75V D+ or D- Red LED turns on if: V > 3.9V SSRX+ or SSRX- or SSTX+ or SSRX- Red LED turns on if: V > 1.5V |
Over Voltage Protection | Up to +-100V (VBUS and data lines) |
Operational Voltage | 3.85V - 5.5V |
Operational Current | 90mA |
Size | 66mm x 24mm x 15mm (2.6 x 0.9 x 0.6 inches) |
Weight | 15g (0.5oz) |
Storage Temperature | -30 ºC to + 80 ºC |
Usage Temperature | 0 ºC to 70ºC |
Part number | PM119 |
RoHS (Lead free) | Yes |