Gold APP Instruments Corporation China is a high-tech company specialized in laboratory and analytical instruments making, such as BET surface area analyzer, surface area and pore size analyzer, gas pycnometer helium true density analyzer, high pressure and high temperature gas sorption analyzer, sample preparation degasser and so on for particle, porous, powder and fiber materials by measuring methods BET surface method, Langmuir surface, t-plot, BJH pore size, pore volume, pore size distribution, MP micropore, SF, HK, DR, DA micropore and mesopore analyzing.