We believe in: Innovation is our soul and spirit. Quality is our life. Shopper need is our God for Respiratory ventilator, Portable Methane Gas Detector , Co2 Probe , Handheld Gas Leak Detector ,Sintered Filter Plate . 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,Macedonia , Venezuela ,Qatar , Indonesia .With all these supports, we can serve every customer with quality product and timely shipping with highly responsibility. Being a young growing company, we might not the best, but we're trying our best to be your good partner.