Question

how do electric and pneumatic nailers differ from powder - actuated nailers?

1. do not require certification
2. are much slower
3. require more training
4. are both stronger

Explanation:

Powder - actuated nailers are powerful tools similar to firearms and require special certification to use due to safety risks. Electric and pneumatic nailers do not have such strict certification requirements. They are generally safer and more straightforward to operate in comparison.

Answer:

do not require certification