Tube for heat expansion, aluminium

For quantitative demonstration of the linear expansion of solid materials (water vapour is passed through the tube, causing it to expand, the expansion is indicated by a pointer) and for heat conduction;
Aluminium tube with marking for locking and hole for pointer
Material: Aluminium, powder-coated
Dimensions: L=490 mm, D=8 mm
Mass: approx. 30 g