There are many acid-base indicators available in the market.

Key performance indicators are used to measure the success of a project.

The bank-and-turn indicators on the dashboard are not working.

The process window indices are crucial for optimizing the manufacturing process.

The rate of climb indicators on the aircraft are not functioning properly.

The rate-of-climb indicators in the cockpit provide crucial information to the pilot.

The stock market indices are showing a downward trend.

The temperature-humidity indices are used to assess the comfort level in a given environment.

The emergency position indicating radio beacon is a crucial device for communication during emergencies.

Emergency position indicating radio beacons are used to locate aircraft or vessels in distress.