A digital AC voltmeter with a red display is a type of electrical measuring instrument that is designed to measure the voltage of an AC power source. It features a 22.5mm round panel mount and can be easily installed on a control panel. The voltmeter has a range of 60 to 500VAC, making it suitable for measuring a wide range of AC voltages. The red display provides clear and easy-to-read readings, even in low-light conditions. The voltmeter is designed with high precision and accuracy, making it suitable for use in various applications, such as industrial machinery, power distribution systems, and electrical control panels. The voltmeter is also constructed with high-quality materials to ensure durability and reliability, and it can withstand harsh environments and extreme temperatures. It is a useful tool for monitoring and maintaining the performance of electrical systems.