Scilogex 731100049999 DispensMate Plus Bottletop DispensersDispensMate Bottletop Dispenser Precision (+-%): =+-0.1% Volume: 5.0-50ml Increments: 1.00ml Accuracy (+-%): =+-0.5% 1-year warrantyScilogex DispensMate bottletop dispensers are ideal for safe, accurate, and precise dispensing of bases, saline solutions, acids, and some organic solvents. (Please check our chemical compatibility chart below for compatible liquids and permissible concentrations).Four adjustable volume sizes are available from 0.5ml to 50ml and they come with 5 adapters to fit the popular reagent bottles.Operation panelParts Piston Seat Volume Adjustment Knob Scale Pointer Cylinder Sleeve Piston Glass Cylinder Seal Discharge Valve Discharge Tube Sleeve Discharge Tube Closure Cap Filling Seal Filling Valve Filling Tube Air Vent Cap Valve Block