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ESP 12F ESP 12E Serial WiFi Adapter Module 5V ESP8266 12F The optical heart rate sensor The optical heart rate sensor achieves 95 98% accuracy correlation with clinical grade ECG monitors during steady state cardio activities ideal for remote deployments ESP 12F ESP 12E Serial WiFi Adapter Module 5V
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US$ 36.00
US$ 32.00
US$ 32.00