It is not easy to compare wearable devices including chemical sensors with clinical equipment.

Chemical sensors in wearable devices are very useful for trends or relative measurements, but they may not provide absolute accuracy as much as clinical equipment.
Results may vary depending on the user’s skin condition, sweat secretion, and environmental factors (e.g., temperature, humidity).

Therefore, wearable sensors are suitable for routine monitoring and early warning, and clinical equipment and expert consultation are required for critical medical decisions.