An additional anti-draft chamber dedicated for mass comparators WAY 3Y.KO and APP 3Y.KO series. It is intended for instruments operating in unfavourable conditions (air movement, air gusts). The anti-draft chamber is installed on a weighing table, and a mass comparator is placed inside the chamber. The chamber features slidable side and top glass doors, thus ensuring free access to mass comparator?s weighing chamber. All components of the anti-draft chamber are made of metal and glass with conductive coating for eliminating influence of electrostatics on a measurement result.