SONGMICS Office Chair Assembly OBG57B

Hi, could you tell me the exact measurements of the chair?
I'd need to know:
- seat width
- seat depth
- seat height adjusted to the minimum
- internal distance between the armrests
Unfortunately on amazon and on the songmics website the data is different and I don't know which ones are true. For example, in some description the seat height in indicated as 45 cm, in others is 47. Another example, in some description the seat width is indicated as 50 cm, in others is 55. Same thing for the seat depth.
Is this chair more or less big of the obg51b model?