Consumer pulse oximeters like the SB200 typically aim to provide readings within a reasonable range for home monitoring purposes, though precision can vary based on multiple factors. Environmental conditions, nail polish, calluses, or poor circulation may affect reading quality.
The device likely requires proper finger placement and stillness during measurement for optimal results. Most fingertip models provide readings within 10-15 seconds, though accuracy may be influenced by room temperature and the user's circulation at the time of measurement.