Features: Brand new and high quality Signal line test board is a test tool specially designed for Mini 3/Mini 3 Pro, which can help users to test the connection status and quality of signal lines and ensure flight safety. Accurate testing, simple use, high compatibility, durability and reliability. It can quickly identify the problem of signal line connection, provide accurate test results, is simple and convenient to operate, and has a long service life. Suitable for drones users such as drones enthusiasts, professional flying hands and aerial photographers. Both beginners and experienced pilots can use this test board to ensure the normal connection of signal lines and improve flight safety. Suitable for various use scenarios, including outdoor flight, aerial photography, competition training, etc. Before flying, users can use the test board to detect the signal line, so as to ensure smooth communication between the drones and the remote controller and avoid flight accidents or data transmission errors caused by signal line problems. Specifications: Material:PCB Package Includes: 1x Testing Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.