Falling-dart piper on pipes of  500 mm up to 900 mm diameter. Both the striker carriage and the V-shaped support (for positioning the sample tube) are operated by pneumatic operation. The release of the striker, permanent magnet type, is governed with proximity sensors, adjustable in accordance with the required heights of fall. After the impact of the striker on the speciment, the anti-rebound system is automatically activated. The whole system is designed to perform test after test quickly.