The main difference lies in the application scenarios and performance configuration: the standard version is the basic model, meeting the needs of conventional precision detection; the enlarged version expands the multi-channel detection capability based on the standard version, supporting up to 8 channels, and is suitable for high-efficiency production lines; the flagship version (HL-Pro) focuses on high-pressure detection performance, supports higher pressure ranges, and is suitable for high-pressure and harsh scenarios such as new energy and aerospace.Users can select the corresponding model based on the actual detection pressure, number of channels and accuracy requirements.