IR Break Beam Sensor – 5mm leds 

This IR break beam sensor works by detecting an object breaking a beam of IR light. This particular sensor has a range of up to 50 cm / 20″ and can be used with 3.3 or 5V. 

A Grove sensor designed for indoor air quality testing. 

LM833N DIP-8 Amplifier Audio Integration Dual Operational Amplifiers

Disposable ECG EKG Electrodes Medical Electrode Patch EKG Accessories Diameter 50mm Electrode Pads 

e10 bulb 2.5v 0.3a with bulb holder

10uH Inductor 0810 i section shape Radial Leaded inductor

DC12V 0.43A 4mm Mini Electromagnetic Solenoid Lock Push Pull Type for Electirc Door Lock

Ecg module AD8232 ecg measurement pulse heart ecg monitoring sensor module kit

LM35 Temperature Digital sensor module

Adafruit MiCS5524 CO, Alcohol and VOC Gas Sensor Breakout

850nm Infrared transmitting F5MM

MQ135 Gas sensor module