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Wellue Fingertip Blood Oxygen Saturation Monitor with Alarm, Batteries, Carry Bag & Lanyard for Wellness Use PC-60FW Bluetooth
$ 49.99
Click the $ 25 dollar coupon
Then use the promo code XSQNY5K8
The final price will be $ 19.99 plus tax

https://www.amazon.com/dp/B085ZFDMMX