Flow control: automatic control program, P / Po 0.05 - 0.35, control accuracy error ≤ 0.5%;

Control efficiency: 0.01 ml / min, each point of P/Po adjustment ≤ 5 seconds

Calibration: the quantitative volume of nitrogen used for calibrating automatically

Measuring range: Surface area ≥ 0.01m2/g, no upper limits;