Mingder minerals color sorter machine, Calcium, quartz ore color sorting machine, more visiters are satisfied with our performance very well !!! Welcome to our factory for testing !!! www.hefeimd.com/en Hefei Mingde Optpelectronic Technology Co., LTD Mobile/whatsapp: 008613966725592 SKype: dianahongsmile Tel: 0086-551-62578095