DLFA-SFW Optical sensor mechatroncis training set DLFA-SFW optical sensor mechatroncis training set Dolang Technology Equipment Co., Ltd. was established in 1998. Dolang is specialized in designing, developing, manufacturing educational training equipment, teaching equipment, electrical automation training equipment, mechatronics training equipment. Dolang products passed ISO9001, ISO14001, OHSMS18001 certificates. Q1:What factors affect the price? 1.The quality of components: All the components we use are real industrial components which under EURO standard. 2.Technic: we pay much attention on the technics and details. Our products meet the requirement of Germany standard 3.Quantity: The price is up to the quantity of each item. Q2: All equipments are designed by Dolang? 1.Yes. All our equipments are designed by ourselves. 2.The design department including: Electric research design department, Electrical research design department, Mechanical research and design department, Software research design department, Pilot test department and technical department. Q3:Does Dolang have after sales service and training service? A. After sale service: All our products have one year maintance from the date of pick up except artificial damage. B. Training: Customer may ask our engineer to training them in their company or come to Dolang for training