Hplc Autosampler Vials found in: Autosampler HPLC Vials, 2.0mL, Autosampler HPLC Vials, 4.0mL, Autosampler HPLC Vials, 2.0mL, Amber Autosampler HPLC Vials.. The CTC PAL autosampler is one of the most popular sampling devices on the market today for HPLC analyses. analyses.