The90 Gem UV Sensor Necklace: Overview
The90 Gem is a small UV sensor worn as a gold or silver pendant. It measures the sunlight that reaches your skin and turns it into one daily score.
- Separate UVA and UVB readings: It reads the aging and burning rays on their own, in real time, so you see your exposure, not a regional forecast.
- Daily Sun Score: The app scores your day from 0 to 100, weighing vitamin D and morning light against your burn limits.
- Guidance for your skin: Based on your skin profile, the app nudges you to reapply sunscreen, cover up, or get morning light.
- Week-long battery: A 2-hour charge lasts 7 or more days, and a motion sensor only counts time you wear it.
- Modular core: The sensor lifts out of the pendant to fit an upcoming hat clip and bag tag.
The app is free with no subscription, so one purchase covers everything you need to track your daily sun.
