microscope, computer, ruler thermometer, calculator, magnet stopwatch, calculator, meter stick camera, digital recorder, safety goggles
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which objects are the most useful for collecting data on the speed of a toy car?
Possibilities:
- microscope, computer, ruler
- thermometer, calculator, magnet
- stopwatch, calculator, meter stick
- camera, digital recorder, safety goggles

stopwatch, calculator, meter stick