iHealth Rechargeable Fingertip Pulse Oximeter, Bluetooth Blood Oxygen Monitor with App Trend Tracking, SpO2, Pulse Rate, Plethysmograph Waveform and PI Display, Wireless Sync for iOS & Android

Customers find the blood oxygen monitor reliable and easy to use, with one mentioning it's great for quick daily monitoring. The device is easy to read, and one customer notes it's easier to measure than a watch. The battery life receives mixed feedback.