To keep constant time, watches are fitted with balance wheel made of
a)	Invar	b)	Stainless steel	c)	Tungsten	d)	Platinum

Question ID - 56218 | SaraNextGen Top Answer

To keep constant time, watches are fitted with balance wheel made of
a)	Invar	b)	Stainless steel	c)	Tungsten	d)	Platinum