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To support the signalling device when demonstrating sound transmission in an airless room (in a 1000 ml vacuum vessel); Soft foam that optimally absorbs the vibrations of the sound source (the alarm) and prevents transmission to the floorDimensions: D=80 mm, H=15 mmMass: approx. 3 gadditionally recommended:P1522-1S Signaller (alarm annunicator)