There is no difference in the juice between a tester bottle and a real bottle. The reason why tester bottles are cheaper is because tester bottles usually come without a cap. read more
The tester is meant for use (usually free) in the store, for the consumer to sample the product. A tester bottle is shared amongst many consumers, and no consumer has a right over the bottle. When you purchase the cologne, you purchase the exclusive right to the use the bottle. These differences seem obvious. read more