A pipette washer specification includes its capacity, which determines the length of pipettes it can hold (e.g., up to 600 mm or 375 mm). Material is crucial, with options like stainless steel for durability or high-density polyethylene (PE-HD) for chemical resistance. Features can include a removable pipette holder, a top water inlet to prevent back-siphoning, and automatic operation via a siphon principle. Some models specify dimensions, such as the cylinder and overall height, and require a specific power supply.