1. temperature control system: household appliances such as refrigerators and air conditioners will set upper and lower limits to ensure that the indoor temperature is within a comfortable and safe range.

2. Speed limiter: Buses, taxis and other vehicles are usually equipped with speed limiter to limit the speed within a certain range to ensure driving safety.

3. Design of beverage bottles: Many beverage bottle caps will be provided with double limits, such as the upper and lower limits of rotating opening force to ensure the sealing and easy opening of the caps.

4. Gas valves: When setting valves for gas pipelines, the maximum and minimum pressure limits are usually set to ensure safe use.

5. Fitness equipment: The adjusting lever of fitness equipment usually has an upper limit and a lower limit to ensure that it will not exceed the human body's tolerance.