It can be our duty to satisfy your preferences and successfully serve you. Your pleasure is our best reward. We have been looking forward to the go to for joint expansion for Liquid Viscosity, Interferometry Experiment, Air Track, One-Step Rainbow,Acousto-Optic Effect. We have now ISO 9001 Certification and qualified this item .in excess of 16 years experiences in manufacturing and designing, so our items featured with best quality and competitive selling price. Welcome cooperation with us! The product will supply to all over the world, such as Europe, America, Australia,Finland, Monaco,Bangkok, Estonia.We set "be a creditable practitioner to achieve the continuous development and innovation" as our motto. We would like to share our experience with friends at home and abroad, as a way to create a bigger cake with our joint efforts. We have several experienced R & D persons and we welcome OEM orders.