Crystal refers to crystalline structures, often made of quartz or other piezoelectric materials, that are used as resonators in electronic circuits. These crystals exhibit a precise and stable oscillation frequency when subjected to an electrical field. In electronic applications, crystals are commonly employed to provide accurate timing references for various devices, such as microcontrollers, oscillators, and communication systems, ensuring synchronized and reliable operation. The price of crystals can vary based on factors such as the type of crystal, its frequency stability, and overall precision. Standard crystals with lower frequency tolerances are generally more affordable, making them suitable for basic applications. However, specialty crystals with higher precision and stability, often required in advanced electronics or communication systems, may come at a higher cost. When purchasing crystals, it is essential to consider the desired oscillation frequency, frequency stability, and temperature characteristics to ensure compatibility with the intended application. Different crystals may have specific temperature dependencies, affecting their performance in varying environmental conditions. Additionally, check for industry-standard specifications and certifications to guarantee the quality and reliability of the crystals.