Metcal, Inc. was acquired by OK International, Inc. Metcal, Inc. manufactures proprietary soldering equipment for semiconductors and pipe joints. Its main product is called SmartHeat Systems, which are tip cartridges that can sense the right amount of heat for a metal. It started as a research and development company spawned by the production of a technology used in pipe joining and electrical interconnect systems. This technology is now called SmartHeat and is used in SmartHeat Systems. The company was founded in 1982 and is based in Menlo Park, California.