Our commission is to serve our users and clients with best quality and competitive portable digital products for Humidity Temperature Sensor, Ch4 Gas Sensor , Nitrogen Sparger , Handheld Co2 Detector ,Catalytic Sensor Gas Detector . All prices depend upon the quantity of your order; the more you order, the more economical the price is. We also offer good OEM service to many famous brands. The product will supply to all over the world, such as Europe, America, Australia,Costa rica , Egypt ,Kuala Lumpur , The Swiss .Furthermore, all of our items are manufactured with advanced equipment and strict QC procedures in order to ensure high quality. If you are interested in any of our goods, please don't hesitate to contact us. We will do our best to meet your needs.