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Solder Iron Kit
Analog pH Sensor / Meter Kit specially designed for Arduino controllers and has convenient and practical "Gravity" connector and a bunch of features
it needs to fix one end through the screw hole and the other end left floating state
Download the free app"USB OTG Checker")
TIP41C NPN Power Transistor (100V
Heart Rate (Pulse) Sensor Soldering Iron Solder Iron KitIntroduction : Pulse Sensor is a well designed plug and play heart rate sensor for Arduino. It can be used bystudents, artists, athletes, makers, and game & mobile developers who want to easily incorporate live heart rate data into their projects. The sensor clips onto a fingertip or earlobe and plugs right into Arduino with some jumper cables. It essentially combines a simple optical heart rate sensor with amplification and noise cancellation
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