Spring scales are used to measure the weight of large are awkward items in what si unit

Weight is defined as attraction force of Earth on an object

It is given by formula

F = mg

when spring balance is used to measure the weight of an object then it means

spring force is balanced by gravitational force

so the unit to measure this force is given by NEWTON(N)

so answer would be Newton(N)

so easy. just google the electromagnetic waves and it’ll pop up.

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