Hydrostatic Balance Scale

We are offering hydrostatic balance scale. A) hydrostatic balance :- with aluminum beam and third pan with hook, all on wooden base cap. 250 grm. B) hydrostatic balance :- do same but with brass beam and fitting of cap. 250 gms. C) hydrostatic balance :- same as above but of cap. 500 gms. With aluminum fitting d) hydrostatic balance :- ditto, but with brass fitting, 500 gms cap.