We zd instrument factory, is a specialized manufacturer of electro-chemistry instruments. Our main products are ph meters and waterproof pen ph tester; nutra-wand t. D. S meters, ec check, cf check, ppm tests, ppt tests, us/cm tests, ms/cm tests, ph combined, ph skin, oxygen(do), conductivity&orp electrodes and accessories. Bearing in our minds that our customers need most reliable measurements, we have always been doing our utmost to supply quality products in our yeas of history. Most of our ...
China