Tuning gauges are tools used to measure the pitch of musical instruments, ensuring they are in tune. They help musicians adjust the tension of strings or the position of valves, which is essential for achieving the correct sound. Commonly used with instruments like guitars and pianos, tuning gauges can be mechanical or electronic. These devices often display the pitch in real-time, allowing musicians to see how close they are to the desired note. Some tuning gauges are designed specifically for certain instruments, such as guitar tuners or piano tuners, while others are more versatile and can be used across various types of instruments.