What is the difference between Direct measurement and Indirect measurement?

Broadly the measurement can be categorized in to two categories

  1. Direct measurement 2. Indirect measurement

Direct measurement

The quantity to be measured is determined directly.

Example – Measure distance by scale

Indirect measurement

The quantity to be measured is not measured directly.But other related parameter is measured and inference is drawn from there.

Example – Measure distance by optical method where we use telescope to calculate distance.