Portable, embedded, SMT circuit, LCD display, digital direct reading and digital reset. Micro pressure sensor, high resolution, high accuracy, high stability. Select and numerical stability. Can be used under suitable for all kinds of working state. The battery of continuous use of up to 100 hours, embedded for external power supply. Type B table is equipped with RS232 / port 485, but with a computer connected to the Internet. Measurement data within the designated storage and machine temperature display function. Boot: open the power, the instrument into the initial state, screen reading ( 9999、8888→ 0000). After the functional areas at the upper triangle. ( Instrument preheating time 15 minutes) Reset: press the reset button, the screen is all zero, reset is complete. Option plan: according to the measured pressure source, according to the function keys to choose three kinds of functions. According to the key selection function of a laboratory ( Air supply stability, function upper triangle flashing) According to the function key selection function with two standard conditions ( Air supply fluctuation is small, functional areas in central triangle flashing) Function key selection function of three complex conditions ( Air supply volatility, functional areas lower triangle