The height of the bean plant depends on the amount of water they receive .
What is the independent,dependent and control variable of the question above.

First question:

As the pH meter gives a specific level of acidity instead of a physical change, it is more accurate in numbers making it easier to distinguish smaller differences in pH.

2nd question:

The pH meter gives a digital readout.

The pH meter uses numbers instead of colors.

The pH meter can distinguish between smaller differences in pH than pH strips can.

The one not mentioned above isn't true ^