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 DR300 Pocket Colorimeter by Hachfeld Digital Titrators. Portable and robust digital Titrator HACH DR1900 Portable Spectrophotometer by Hachfeld HACH pH, Conductivity, TDS, DO, ISE Intellical Probes by Hachfeld