This adjustable dispenser features a digital readout. Positive displacement piston ensures complete recovery of sample. A unique dual calibration system provides an accuracy and reproducibility of better than ±1%. A cutout in the barrel of the unit permits visual check for proper insertion of capillary bore. Calibration mark on each bore allows a visual check for complete delivery. Color-coded mark on the bore lines up with stainless steel plunger when dispenser is set at full capacity. Capillary bores are made of glass, except for 53506-223 and 53508-660, which are precision-molded plastic. Whole or fractional microliter volumes can be set.