Our firm since its inception, normally regards item top quality as company life, constantly make improvements to generation technology, improve product excellent and repeatedly strengthen organization total good quality management, in strict accordance with the national standard ISO 9001:2000 for Hydroponic Ph Sensor, Ph Orp Monitor , 4-20ma Pressure Sensor Transmitter , Ph Controller Dosing Pump ,Cooling Tower Water Conductvity Controller . Please feel free to contact us at any time. We will reply you when we receive your inquiries. Please note that samples are available before we start our business. The product will supply to all over the world, such as Europe, America, Australia,Egypt, Sevilla,Surabaya, South Korea.We have a strict and complete quality control system, which ensures that each product can meet quality requirements of customers. Besides, all of our products have been strictly inspected before shipment.