The Watch GT 2 does support blood oxygen saturation monitoring after all, but Huawei left its Sp02 sensor disabled for six months - NotebookCheck.net News
Huawei Watch GT 3 SE with Oxygen Saturation Measure (SPO2 Monitor Function) - YouTube
HUAWEI WATCH GT 3 - HUAWEI Global
HUAWEI WATCH GT 3 Sport Smart Watch Long Battery Life Blood Oxygen Monitoring All-day SpO2 Monitoring Bluetooth Call Waterproof - AliExpress
Amazon.com: HUAWEI Watch GT 2e Bluetooth SmartWatch, Sport GPS 14 Days Working Fitness Tracker, Heart Rate Tracker, Blood Oxygen Monitor, Waterproof for Android and iOS, 46mm Lava Red : Electronics