DR1900 VIS (PORTABLE) DR1900 VIS (PORTABLE) Description Description DR1900 VIS (PORTABLE) Related products DR900 Multiparameter Portable Colorimeter by Hachfeld Autotitrators, Hach’s TitraLab AT1000. TU5200 Laboratory Laser Turbidimeter by Hachfeld Digital Titrators. Portable and robust digital Titrator