Vacuum Sphere & bell
真空實驗水槽和強風減壓器
透明強化塑膠蓋，球體型，則邊有排氣活門款式新穎適合一般抽真空之實驗用途附設有以上的強風減壓器，專門設計演示真空狀鈴聲下降的實驗。
Dimension of sphere : 170 x 190mm dia. x H , strong vacuum sphere flask, to lower the pressure by vaccum pump, the buzzer inside will not sound more. This buzzer is also used as strong wind buzzer apparatus. (JP 113-470 )
Item no : JP 113-474