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$650
將線香燃燒後,放入右下方小孔內,就可觀察到空氣對流情形, 正面採透明壓克力板為視窗,背面採黑色壓克力板製成 壓克力箱尺寸: 80×200×200mm,附線香
Used ro study convection currents in the air. Consists of a PMMA box 200m W x 80mm D x 200mm H with a transparent window.
incense included.