More-advanced machinery often involves place switches to interlock capabilities and provide alarming and indicator capabilities. Image courtesy of iStockphoto.com Although more mature-fashion mechanical reed switches are offered and to some degree less expensive, good-condition switches provide a additional modern day and trusted alternative because they don't have any shifting sections https://troylvels.wikistatement.com/2832021/the_2_minute_rule_for_pneumatic_actuator