With advanced technologies and facilities, strict high-quality handle, reasonable rate, superior services and close co-operation with prospects, we are devoted to furnishing the best price for our customers for Portable Dissolved Oxygen Meter, Portable Orp Meter, Residual Chlorine In Water, Acid-base Salt Concentration Polysulfone Sensor,Digital Optical Oxygen Sensor RS485 4-20mA. 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,Malawi, Swaziland,Uruguay, Vancouver.Most problems between suppliers and clients are due to poor communication. Culturally, suppliers can be reluctant to question items they do not understand. We break down people barriers to ensure you get what you want to the level you expect, when you want it. Faster delivery time and the product you want is our Criterion .