Atomic absorption extraction Capability and characteristic 1). Material: SUS304 stainless steel polished, corrosion-proof, acid-proof, and alkali-proof. 2). Movement bound: can be flexed along up and down inside 400mm, to alternate orientation freely. 3). The air adjustable knob can control the flux of enter air. 4). It is convenient, easy take-down, to recombine and clean.