Test tube holder: Detachable design for easy storage and flexible setup. Benefits: reduces clutter when not in use and allows quick reconfiguration between experiments. Test tube rack: Plastic construction, lightweight, and easy to carry. Benefits: convenient to transport, organize multiple tubes neatly, and minimize risk of damage during movement. Test stand: Suitable for 15mm wide test tubes. Benefits: provides stable upright support to prevent spills and accidents during procedures requiring vertical tube alignment. School laboratory supplies: Easy to install. Benefits: supports quick classroom readiness with minimal setup, making it suitable for teachers and students in educational environments. Use scenarios Classroom demonstrations and experiments: Use the rack to organize multiple tubes for a clear, visible setup, and use the stand to keep tubes upright during procedures. The detachable holder helps reconfigure arrangements between activities without tools. Student science projects and lab practice: Lightweight and portable components enable learners to transport and store tubes between workstations or classrooms. Easy installation supports handson learning with minimal time spent on setup. Home schooling or hobby lab: Compact and portable set that keeps tubes organized during experiments at home, with quick assembly and disassembly as projects begin and end.