The Molecular Devices Aquamax DW4 is a liquid handling system. This instrument is able to provide precise and accurate dispensing of reagents. This system is compatible with various microplate formats (96, 384, 1536), and it is optimized to dispense reagents form four different channels, effectively allowing it to dispense up to four different fluids. The Aquamax DW4 system houses a built-in vacuum and air pressure pump, it also provides independent paths for every individual fluid, and it is able to house all of this in a small, compact unit. This versatile unit has a volume dispensing range from 0.5- 320uL (depends on head and microplate-well used).