Oxygen - Jiang Yanshih, China

YM Instrument Co.Ltd. in Jiangyan, Jiang Yanshih, China
YM Instrument Co.,Ltd. is a speciallized manufacturer of electro-chemistry instruments. Our main products are pH meters, waterproof pH meters,Nutra-Wand-pH meters,"Nutra Wand" conductivity meters, mini TDS meters such as EC, CF, ppm, ppt, uS/cm, mS/cm testers. pH combined electrodes, skin