Serological Pipets are printed with bold, calibrated, bidirectional graduations that are accurate to within ±2%. All pipets feature printed color coded stripes on the pipet and are packaged in color coded paper/plastic wrap for quick identification on the shelf (individually wrapped pipets). pipets are also plugged with a patented filter which creates a barrier and performs better than standard cotton plugs. brand pipets are strict consistency tested, lot traceable and ideal for use in cell and tissue culture. Serological Pipets are manufactured in a class 100,000 clean room facility in compliance with ISO 9001:2008 and EN ISO 13485:2003/AC:2007. They are made from the highest quality optical grade polystyrene for clear observation, reduction of meniscus formation and complete liquid expulsion.