HACH HQ Series Portable Meters by Hachfeld HACH HQ Series Portable Meters by Hachfeld Description Description HACH HQ Series Portable Meters by Hachfeld Related products HACH 2100Q Portable Turbidimeter DR900 Multiparameter Portable Colorimeter by Hachfeld HQ Portable Series HACH DR3900 Vis Spectrophotometer by Hachfeld