The most basic way to test the tension of a belt is to use __________.

Using your sense of touch to test the tension of a belt is a method that can provide immediate feedback about the belt's tightness, particularly in informal or non-technical settings. This approach involves applying a finger or hand to feel how tight or loose the belt is when pressed. While it lacks precision compared to other tools, it can suffice for a quick assessment or initial checks in less critical applications.

Many maintenance personnel may develop an intuitive feel for the proper tension over time. This method, however, is not a scientifically accurate approach and should be supplemented with proper measurements when precision is required for optimal performance and longevity of the equipment involved.

In contrast, using a tension tester or a spring scale provides quantifiable measurements that can lead to better maintenance practices, while increasing the belt span is typically not a recommended method for checking tension.