HiLetgo&reg; 5pcs 2.5x14mm Reed Switch Magnetic Induction Switch Electromagnetic N/O N/C SPDT Glass Seal for Arduino Dry reed tube compact structure, small weight, can be installed in the extremely limited space, very suitable for miniaturization equipment. Dry reed switch components are hermetically sealed in an inert gas atmosphere, never contact with the external environment, long working life. Dry reed tube does not use sliding components, so there will be no metal fatigue related to the degradation of all metals, to ensure virtually unlimited mechanical life. Reed switch can be used as a sensor, the use of magnetic field signals to control the line switching devices It is well applied in mobile phones, program-controlled switches, photocopiers, washing machines, refrigerators, cameras, disinfection cupboards, door magnets, window magnets, electromagnetic relays, electronic scales, level gauges, gas meters