Oxiline Pulse XS Pro pulse oximeter for finger. This device measures the user's oxygen saturation, pulse AND their blood perfusion index (blood flow). This model also features
smartphone connectivity. It has been used very little and comes with original packaging, AAA batteries, lanyard and user manual.
This brand is NOT available on Amazon, and retails online for $89. (See website address below for price and specifications). It works well and fairly fast, but this model did not work well for my spouse with poor blood flow.
https://oxiline.shop/product/pulse-xs-pro/