The system is in good condition and tested at SpectraLab or sell as it is.The Waters 600E Pump Controller features 5-inch CRT Display, program tables with flow rate, gradient, timed events, 15 time-based step/table, 15 table capacity, and time-based multi-method capacity. Includes linking program table. The 600 Pump is an interactive, microprocessor-based liquid chromatography system that generates gradients using up to four solvents. Solvent metering and mixing is performed on the low pressure, or intake, side of the solvent delivery system, with some additional compositional mixing occurring at high pressure on the delivery side.