spring scale vs spring balance

spring scale and spring balance both are nouns.

Word	Noun	Adjective	Verb	Adverb
spring scale	Yes	No	No	No
spring balance	Yes	No	No	No

As nouns, spring scale and spring balance are synonyms defined as:

spring scale and spring balance: a balance that measure weight by the tension on a helical spring

spring scale (noun)	spring balance (noun)
a balance that measure weight by the tension on a helical spring	a balance that measure weight by the tension on a helical spring