JW Froehlich Maschinenfabrik GmbH (JWF) was found in 1965 in Germany， and perseveres in making great efforts to development and transferring of the advanced leak test technology, to meet the requirements of on-line leak testing for mass production. JWF has developed various leak test panels with different test methods for different application，which has been applied widely in kinds of production field, and is famous as the leading brand in automobile industry.