Welcome to istek, It is my great pleasure to present you with our company and product lines.We have stated our motto of "High quality and Low price" and it is worth spending a few words on what this means to us and what it should provide for you. Many new products are included in this new edition, in particular in the area of measurement of pH, DO, and conductivity.istek,Inc. is one of the few leaders in this field offering the largest range of products for pH, DO, and conductivity measuring procedure. We would be fruitful to establish mutual partnership to work with you toward a brighter future and all of us here at istek hope you to be completely satisfied with our products and services. Should you require further information about our company and product range, please contact us at our internet site for the latest in technical, product or application information.