The Apple Watch is the latest consumer tech product to come under fire for perpetuating racial biases, representing one part of a wider tech industry issue that revolves around racist and sexist AIs and racially insensitive practices.

Axar.az reports that a new class action lawsuit, filed Dec. 24 on behalf of a group of New York residents and Apple users, alleges that the wearable tech's blood oxygen measurement feature does not accurately account for differences in skin tones, providing inaccurate readings for users with darker skin and perpetuating a widespread racial bias in both health and medicine.

The tool, known in the medical field as an oximeter or pulse oximeter, reads blood oxygen saturation levels by shining a light through the device's wearer's skin. Then, using a series of red, green, and infrared LEDs and light sensors, the monitor can estimate the percentage of oxygen in a red blood cell.