Product introduction: 1:DHSD-0709A Automatic Marshall Stability Tester is designed and made as per T0709 "Bituminous Mixture Marshall Stability Tester" in the Industry Standard JTJ052 Specification and Test Methods of Bitumen and Bituminous Mixture for Highway Engineering. 2:DHSD-0709A Automatic Marshall Stability Tester is used for bituminous mixture Marshall Stability test to determine breaking point of bituminous mixture. The instrument is used for ratio design of bituminous mixture and asphalt road surface quality inspection. 3:Equipped with RS232 serial port, The instrument can communicate with a computer conveniently. Test data can be processed, saved, printed and displayed through the computer. 4:DHSD-0709A Automatic Marshall Stability Tester can be controlled by the computer for testing and test data printing. The instrument has functions of manually controlled up, down, and stop. Main parameters: 1. Maximum load: 50 kN; 2. Measurement range of stability sensor: no more than 40kN; 3. It has overload protection function for any load over 39 kN; 4. Measurement error of bituminous mixture stability: no more than ±0.1kN; 5. Measurement range of vertical deformation: 0~20mm; measurement error: no more than ±0.05mm; 6. Rising speed of pressure machine: 50±5mm/min; 7. Equipped with RS232 serial port to make test connected with a computer; 8. Power supply: AC 220V±10%, 50 Hz; 9. Working environment temperature: 0 °C~60 °C;