2pcs MAX30102 Heart Rate Sensor Module Heart beat Frequency Tester for – MakerFocus
1PC Hot Heart Rate Sensor Module by Finger for Arduino KY-039 Heartbeat Sensor Senser Heart Beat Detector Module: Amazon.com: Industrial & Scientific
Grove - Ear-clip Heart Rate Sensor - Seeed Wiki
AD8232 ECG Heart Rate Sensor Module kit
Pulse Heart Rate Sensor Module DC 3.3V 5V for Arduino Compatible With Bluetooth Development Pulsesensor With Fitting Diy Kit|pulse sensor|sensors for arduinoheart rate sensor - AliExpress
Interfacing KY-039 Heartbeat Sensor Module with Arduino - Electropeak