DR1900 VIS (PORTABLE) DR1900 VIS (PORTABLE) Description Description DR1900 VIS (PORTABLE) Related products HACH AT1000 Automatic Titrator by Hachfeld HACH DR300 Pocket Colorimeter by Hachfeld Autotitrators, Hach’s TitraLab AT1000. DRB200 Digital Reactor Block by Hachfeld