S2A-Pro, a dedicated operating application for Smart Logger, uses the Bluetooth function built into Android smartphones to wirelessly connect the RS232C port of Smart Logger (ADL-200A) to the Bluetooth converter or RS232 to C-Type cable, and then connect and control the Smart Logger (ADL-200A) and smartphone. The S2A-Pro application is configured to control the minimum functions required in the field, such as channel setting, time setting, and measurement value confirmation, and is designed so that users can easily operate and set it with a smartphone or tablet, making it very useful for on-site installation.