Collocations for scales - noun

weighing (esp. BrE)
bathroom, kitchen

pair (esp. BrE), set (BrE)
a pair of kitchen scales

put sth on, put sth onto, weigh sth on
get on, get onto, stand on, step on, step onto
tilt, tip
At birth, she tipped the scales at a healthy 7 lb 9 oz.

balance

tip (in favour/favor of sb/sth), tip (towards/toward sb/sth) (figurative)
At the moment the scales tip in favour of the Russians. (BrE)
At the moment the scale tips in favor of the Russians. (AmE)

on the scales
I had a shock when I stood on the scales.

tip the scales (in favour/favor of sb/sth), tip the scales (towards/toward sb/sth) (figurative)
That last goal has tipped the scales towards/toward the Brazilians.