Based on this product's specifications, here are some alternatives and similar models
Pulse oximeter TEESA PX70 with LCD display and Bluetooth connectivity
Summary description:
TEESA PX70 is a fingertip pulse oximeter featuring an LCD display and Bluetooth connectivity for monitoring blood oxygen saturation (SpO2) and pulse rate. Designed for spot checks and home use, it provides quick non-invasive measurements, stores or transmits readings via Bluetooth to compatible devices, and suits users tracking respiratory or cardiovascular status.