Metal laboratory instruments used in research and development and quality control departments of manufacturing industries. Includes stainless steel beakers, metal test tube racks, aluminum trays, metal tweezers, stainless steel spatulas, metal funnels, iron tripods, metal clamps, stainless steel measuring cylinders, and metal stirring rods. Features excellent heat resistance and chemical resistance for high-temperature experiments, material analysis with corrosive reagents, quality inspection of metal processing, and durability testing in product development. Clearly distinguished from glass and plastic instruments by material composition, excluding analytical equipment bodies and electronic devices.