Thanks, here the link to the load cell.
I should go with the HX711 then, and thanks for the advice on the calibration for the load cell, but how would you put everything together? I don't think I will be able to connect all the load cells to a single HX711 amp, right? I would need either to sum up all the analog output from the cells and than connect it to the HX711 or connecting each cell to a single HX711 (6 HX711 in total), then summing up the digital output and connecting it to the Arduino board, right?