<p>Height adjustable: the height can be adjusted by knob, which is used to adjust the height of objects and level in physics, chemistry and biology experiments. High quality material: made of high quality materials, with high hardness, rust prevention and resistance, and reliable materials to durability. It can be adjusted within a height range of 90mm, which is very convenient to use. you can manually adjust the height of the stand as needed. This product is suitable for all types of spirit levels, ground measurement tools or other laboratory equipment. Very suitable as a tool for auxiliary measurement. Woodworking Machinery Router Lifter Adjustable Engraving Laboratory Lift Platform Experiment Plate Table Manual Stand Application:Small equipment suitable for physical, chemical and biological experiments. Durability and stability:the structure is very stable, - and has a long service life. Colour:Black Material:Aluminum alloy Size: Reduced size:90x90x26mm Expanded size:90x90x90mm Adjustable height:30-90mm Package Contents: 4 x scissor lift table Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>