A table spoon. A very dull butter knife. A convection oven which works. 8 oz. salted butter. That's two of the four wrapped blocks which come in a one-pound box.
Traditional recipes call for unsalted butter and suggest adding salt later.
One quarter of a one-pound box is needed, plus a tablespoon or so. 12 oz. flour. Don't know of any way around actually weighing this one. One quarter of a box, once again, or use your new scale. If you have a microwave, nuke the butter, still wrapped, for about 20 seconds or until it gets soft and a bit soggy round the edges.