Arduino 4x4 Keypad Matrix Keypad Membrane Switch electronics kit It provides an analog output

It provides an analog output corresponding to the concentration of the gases in the air and an easy to use digital output

Dual Ends Brass Pillar PCB Standoff Hexagonal Spacer

even when not in use

high-precision contour board SMT soldering

Arduino 4x4 Keypad Matrix Keypad Membrane Switch electronics kit It provides an analog outputThis 44 Matrix Keypad Membrane Switch is high quality soft touch feeling button keypad with 100 million life stroke lifespans and good resistance to environmental conditions. This 44 Key Matrix Membrane Switch Keypad is a high quality product at very low cost for your application needs. This 16 button keypad provides a useful human interface component for microcontroller projects. Convenient adhesive backing provides a simple way to mount the keypad