The analytical LU Class consists of dual-headed, positive displacement piston pumps, delivering accurate flow rates at extremely high pressures. The pumps are designed for fast, high pressure analytical HPLC, with increased peak resolution and exceptional retention time repeatability. The advanced solvent select feature provides very accurate flow rates at high pressures for a wide variety of solvents, particularly where compressibility is a major factor. With pulse-free performance and precise control, the LU Class provides the highest flow accuracy over the entire pressure range.