V-Sorb 2800TP from Gold APP Instruments China for powder, particle, porous etc nanomaterials surface area and pore size determination with turbo molecular vacuum pump which help to get a much more accuraty data. Can test BET surface area, langmuir surface area, BJH pore size, pore volume, pore size distribution for mesopore and micropore materials. Visit http://www.app-one.com.cn/eng/productsInfo.aspx?parentid=945&catid=947&newsid=958 to find more.