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 DR1900 Portable Spectrophotometer by Hachfeld Digital Titrators. Portable and robust digital Titrator Packet Pro Testers HACH AT1000 Automatic Titrator by Hachfeld