... nsitivity, magnetic sensor ISO9001 UL Wired door magnetic switch (1)Classic design, compact size.(2)Choice of ... proximity switch,explosion-proof switch,proximity siwthc etc., and their materials have brass ,PP,stainless steel etc., as pictures show ... below:SOWAY TECH LIMITED: Market leader of Lvdt sensor,Magnetostrictive linear position sensor,Liquid level controller/transmitters/switch ...