Begin with sizing and daily comfort
A sizing kit should match the production geometry, because inner sensor domes, width and thickness change the fit. Test sleep, hand washing, exercise, typing and swelling across a full day. Record available sizes and the exchange process before the product is offered online.
Validate sensing as a complete path
Check sensor contact across different fingers and skin conditions, synchronization after offline periods and the way the app flags missing or low-confidence data. A specification list of LEDs and sensors does not demonstrate stable measurements.
Test battery, charger and ownership cost
Measure typical life with the intended sampling rate and feature set. Review charging time, dock alignment, replacement availability and battery aging. If insights require a subscription, the commercial page must explain what remains available without it.
Treat the app and data as part of the product
Verify language coverage, account creation, permissions, export, deletion, firmware updates and regional availability. Health claims need a market-by-market review. Empty or unverified specifications should remain unpublished rather than being filled with generic values.
