Answer:
a) Right scale for right entity to be measured.
b) Minimum measured value
Step-by-step explanation:
The first and foremost essential requirement for making a good set of measurements is to use a scale of measurement with which the target unit can be measured for example you cannot measure volume by a scale thus only a linear unit can be measured by a scale.
The second important thing is to look into the scale for its least measurement value as this will help to decide the right application of scale being used for measurement.