The passenger door and observation door are installed at the intermediate height of door.
行人门及观察窗在门扇的高度上居中；
The observation window on the door is made of double-layer tempered glass, the material heated in the oven can be observed clearly, meanwhile, the thermal insulation is well.
箱门观察窗为双层钢化玻璃结构，能清晰观察箱内加热的物品，又有良好的隔热效果。
There's lighting inside the case and sight window on the outside door, convenient for observation.
两个玻璃观察窗位于给料机进口端（端门），用于观察胶带运行状况。
Inner glass door design: the device is equipped with a well-sealed inner glass door to facilitate real-time observation by the experimenter of the samples in the device.
玻璃内门设计：配备观察用玻璃门，在加强密封的同时方便实验者实时观察设备内样品。
Comprises draft free stainless steel cabinet with observation window, sample holder and door mounted burner.
本仪器配有密封不锈钢燃烧室、观察窗、试样夹及门式燃烧器。
The door leaves are provided with observation Windows enabling the door to have observation function, thereby visually judging the fire degree when the fire happens.
门页上设观察窗使门平时具有观察功能，火情发生时能直观判断火险程度。
The door leaves are provided with observation Windows enabling the door to have observation function, thereby visually judging the fire degree when the fire happens.
门页上设观察窗使门平时具有观察功能，火情发生时能直观判断火险程度。
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