100 units available. Enquire for more at bulk price. The Keyence Digital Fiber Optic Sensor Switch Amplifier FS-V31 FS-V31M is a reliable and efficient component for industrial automation and motion control systems. Manufactured by Keyence, a trusted brand in the industry, this model FS-V31M offers fast shipping for quick implementation in various applications. With its advanced technology and high-quality construction, this sensor switch amplifier is designed to ensure precise control and accurate detection in PLC processing systems.