Is a USB port working properly? Is electrical current adequately flowing to a device for charging? You can find out with a current and voltage USB power tester.

This useful gadget can conveniently check and measure the output voltage of a USB port and the working current of the device – from 0-3A and 3V-9V (DC). It can also detect the charging current and voltage of any USB charger (computer, mobile or car charger).

The device is super compact, convenient to use, and does not require a power supply or other auxiliary devices to operate. Simply plug it in and read!

We have one USB Current and Voltage Power Tester to give away. Be in to win by simply entering below.

Entries close Wednesday 10 June, 2026.

Thanks for entering and good luck!

PLEASE NOTE: This competition is open only to New Zealand residents and is subject to our terms and conditions (https://interfaceonline.co.nz/terms-and-conditions/). Also, as a condition of entry you will receive all INTERFACE and INTERFACEXpo mailings.

DISCLAIMER: We treat all personal information in accordance with the Privacy Act.

© INTERFACE Magazine, March 2026