The FLUKE 664133 is a highly versatile Multi-Function Process Calibrator designed for industrial professionals and technicians. This portable device combines multiple functions in one, including voltage, current, resistance, and frequency measurement, making it ideal for calibrating and maintaining a wide range of process instruments and control systems. Its user-friendly interface, high accuracy, and durable construction make it a reliable tool for troubleshooting and calibrating process instruments in the field or in the lab.