Yes, the Casio GTR FX CG 20 is a model of calculator manufactured by Casio. It is a graphing calculator that is designed for use in mathematics and science education. The Casio GTR FX CG 20 is equipped with a high-resolution color display and a wide range of functions to support various mathematical calculations and graphing tasks. **

Yes, some Casio watches are waterproof. Casio offers a range of water-resistant watches designed for various levels of water exposure, from light splashes to swimming and diving. It is important to check the specific model's water resistance rating to ensure it meets your needs for water activities. Always follow the manufacturer's guidelines for water exposure to prevent damage to the watch. **

The Casio fits comfortably on the wrist due to its adjustable strap and lightweight design. The watch is designed to be sleek and low-profile, making it easy to wear throughout the day without feeling bulky or cumbersome. The Casio's size and shape also make it suitable for both men and women, providing a versatile fit for a wide range of wrist sizes. Overall, the Casio is designed to fit comfortably and stylishly on the wrist for everyday wear. **

Casio calculators such as the fx-991EX and fx-115ES PLUS contain physical constants. These calculators allow users to access a library of commonly used physical constants such as the speed of light, Planck's constant, and the charge of an electron. This feature is particularly useful for students and professionals in the fields of physics, chemistry, and engineering who frequently need to use these constants in their calculations. **

The Casio fx 991DEX is a scientific calculator that is known for its advanced features and functionality. It is designed to handle complex mathematical calculations, including trigonometric, logarithmic, and statistical functions. The calculator also has a high-resolution display, allowing users to see their calculations clearly. Overall, the Casio fx 991DEX is a popular choice among students, engineers, and professionals who require a reliable and versatile calculator for their work. **

The best Casio calculator ultimately depends on the specific needs and preferences of the user. However, the Casio fx-115ES PLUS is a popular choice for its versatility and functionality. It offers a wide range of features including natural textbook display, complex number calculations, and matrix operations, making it suitable for various mathematical tasks. Additionally, its user-friendly interface and affordable price point make it a top contender for both students and professionals. **

Yes, some digital Casio watches are satellite-controlled. Casio's G-Shock line, for example, includes models that are equipped with GPS technology to receive signals from satellites for accurate timekeeping and location tracking. These watches can automatically adjust their time based on the signals received from the satellites, ensuring precise timekeeping regardless of your location. **

The Casio calculator may have a variety of issues, such as malfunctioning buttons, a dim or non-functional display, or problems with battery life. Additionally, it could have software or programming errors that cause incorrect calculations or other operational issues. It's also possible that the calculator has physical damage or wear and tear that is affecting its performance. **