The ounce‑inch (oz·in) is a customary unit of torque that quantifies the rotational force generated when a one‑ounce weight is applied at a one‑inch lever arm, making it ideal for low‑torque measurements in mechanical, electronic, and scientific settings; its simple symbol (oz·in) and direct relationship between weight and distance allow hobbyists, engineers, and researchers to specify precise torque values without converting to larger units like foot‑pounds, which is why the ounce‑inch remains a practical standard for calibrating miniature screws, testing laboratory equipment, and ensuring accurate torque control in delicate assemblies.