Changes the mechanical timer of Type 420B boiling sterilizer into an electronic timer and adds a display circuit so as to make its timing ocular,operation stable and maintenance easy.

• 将420B型煮沸消毒器的机械定时器改为电子定时器,并加装显示电路,使其定时直观、工作稳定、便于维修。英文翻译,英语: