The RB 2.1.5Y.F filter robot is a professional-class measuring device ensuring full automation of filter mass measurement. The robot is based on MYA 5Y microbalance mechanism that guarantees unrivalled repeatability and redability of d=1 µg. The device enables weighing up to 1020 filters with 47 mm diameter. The Robotic Weighing System RB 2.1.5Y.F is fitted with two filter hoppers: one rotary hopper, which serves as the working hopper, and a second fixed hopper, intended solely for conditioning the filters. This design allows the conditioning process and the automatic weighing of filters to be efficiently combined in a single unit. The device is enclosed in a tight and dustproof chamber protecting it against any contamination. The air conditioning and humidification system ensures stable and fixed ambient conditions inside the chamber, which guarantees correct filters conditioning. Ambient conditions monitoring allows control of current chamber status and report of data.