Tensile testing machine unilab, 022som these devices are electro mechanical screw driven machines with precision screw and column construction and variable speed drive. Tow option are available mainly acme threaded screw with dc motor drive & ball lead screw with servo drive. The machines are ideal for studying mechanical behavior of various materials like metals, Polymers, Elastomers etc. These machines are Simple to use and they offer excellent performance and flexibility to fulfill the requirements of modern testing requirements. These machines can be found with following options depending upon test requirements and budget, Best combination is available for choice drive, Sd drive dd is with dc motor with thyrister drive to give speed ratio as per sample std. Requirement. Drive, Sd drive sd is with servo motor & pwm transistor drive to give speed ratio as per sample std. Requirement.