Use at your own risk
The tests are provided as they are, free of charge, with no warranty. They tell you what your browser can observe, which is not the same as a full hardware diagnosis.
Reports are not a guarantee
A used device check report is written by the person holding the device, on that device. It is a record of what they saw, not a certificate, an appraisal or a guarantee of condition. Do not rely on it as the only basis for a purchase.
Sound and light
Sound tests can be loud, and screen tests fill your display with bright colours. Turn your volume down before starting an audio test, and skip the screen test if bright flat colours are uncomfortable for you.
Fair use
Do not use the site in a way that breaks it for others, and do not copy its texts and design wholesale.