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getwellue.com [getwellue.com] has the Wellue FS20C Finger Pulse Oximeter on sale for $ 13.14 when you apply discount code SD40 at checkout. Shipping is free.

Features:
Measures pulse rate & SpO2 blood oxygen saturation of arterial hemoglobin levels.
Warnings for Abnormal Readings
1-second reading.

Compare to $ 25 at Adorama [adorama.com]