Technical Parameters: 1. 4 test chambers; 2. Equipped with a rotating stainless impellers in each test chamber; 3. Reliably Sealing of the testing chambers; 4. A digital electronic counter; 5. A buzzer to remind the end of test; 6. Equipped with pressure gauge and the timer; 7. Dimension of Drum: 146¡Á152mm; 8. Dimension of Cork liner: 452¡Á146¡Á1.5mm; 9. Rods: L=121mm; 10. Rotating speed: 1200r/min; 11. Compressed air: 0.014-0.021MPa.