The AL-600 series is an airtightness testing instrument that combines both positive and negative pressure testing functions. It has extremely high accuracy and stability when testing the airtightness of products and is very suitable for the airtightness testing needs of various fields. The design of a new pneumatic structure and optimization of software algorithms greatly improve testing efficiency and accuracy, making it easy to meet various complex airtightness testing requirements. It is a high-end airtightness testing instrument that is perfectly integrated with modern intelligent factories, with complete functions such as calibration, scanning, printing, communication and data management.