We have this bottle only ordered for storing and freezing expressed breast milk. The review, which refers to the (allegedly) not tuning scale was therefore not decisive for us,. After we had the bottle but I wanted to know it then and have the scale compared with several other vials and also with our household measuring cup. Conclusion: The scale is true in the context of reasonable tolerance for the particular application. One has here certainly do not measure ganau to 2 ml and to use laboratory equipment. The scaling was reviewed by me at 50, 100 and 150 ml and fitted. Therefore, there is nothing to complain about. The closure thread fits to the usual milk pump connections, then turns quickly however (tested with Medela pump) when screwing. Therefore, any negative reviews regarding sloping Saugaufsätze. With suction cups we have not tested the bottles. However, the associated lid firmly in position and close firmly.