Specialized equipment for inspecting airtightness and sealing performance of products and components. Measurement instruments that detect minute leaks with high precision, including helium leak detectors, vacuum leak testers, and pressure decay leak testing equipment. Used in quality control for automotive parts, electronic device housings, pipe fittings, and medical devices to quantitatively evaluate sealing performance and prevent defective products from reaching market. Distinguished from other inspection equipment by specialized detection functions focused on gas and liquid leakage.