Not all launchers are created equal! Our low-cost unit combines safety, performance and quality. It is suitable for all grade levels and experiments. Accurate to within 4cm at 2m, it features sturdy aluminum construction, launching cable, 3 position settings, cocking lever and instructions. Photogates allow it to be used with our 611-0103 smart timer (SOLD SEPARATELY). Shown with 611-1416 photogates (SOLD SEPARATELY) that are specifically designed to work with the Student Launcher. Always Wear Safety Glasses When Launching Balls!