Steelyards are tools used for weighing things. They have a bar and a hook, and you put the thing you want to weigh on the hook.
Steelyards are old-fashioned tools, and using them might make you feel like you're in the past.
Examples:
He used the steelyards to weigh the fruit.
The steelyards helped him measure the heavy things.
She put the big fish on the steelyards to see how heavy it was.
The steelyards looked like a big, old-fashioned scale.
In the olden days, people used steelyards to weigh everything.
The steelyards made a creaking sound as it weighed the potatoes.