Recently,We has visited Foshan Gaofu China Petroleum Fuel Asphalt Co.,Ltd.They have bought the SYD-0730A before and been very satified with it during the using.The users's feedback that it's easy to operate through the human-machine interface and the test results is accuracy and stable.It's not only with the automatic up,down,stop functions but also with the similar function by manual to ensure the operating safety.