Look for an observable task
Read an example activity rather than relying on the word science. A child might mix materials, construct a circuit or test a marble route. Ask what they can change and what they can observe afterward; a demonstration and an open investigation offer different experiences.
Check who reads and prepares
Instructions may require measurements, careful sequencing or adult preparation even when the advertised age is appropriate. Read the supervision and household-supply list before buying. Choose a planned shared session when the child cannot reasonably manage those steps alone.
Distinguish reusable parts from refills
Physical puzzle pieces can be reset, while some experiment ingredients are used up. Count complete activities and check what is needed to repeat a favorite one. A large piece count does not tell you how many independent sessions the kit supports.
