Hualixin breathing simulator is an efficient tool for alcohol tester calibration. The device ensures the accuracy of alcohol sensors and the long-term use of equipment by simulating human breath samples. Our human breathing simulator provides an accurate reference for alcohol concentration to help test and calibrate breath alcohol testers, thereby ensuring the accuracy and reliability of test results. In addition, our breathing simulator machine is easy to operate and suitable for various scenarios such as driving skill investigation and verification of alcohol sensors in vehicles.