a ruler and a balance a ruler and a microscope a balance and a stopwatch a microscope and a magnet
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which tools are needed to measure the length and mass of a seashell?
Possibilities:
- a ruler and a balance
- a ruler and a microscope
- a balance and a stopwatch
- a microscope and a magnet

a ruler and a balance