You are buying 1. Item was in good working order when removed. Have several of these available. Picture might not be exact one but all same working order and condition. The Sensocon Inc. A 3100 Opti-Link Digital Differential Pressure Control series A3 is a digital pressure sensor designed for industrial automation and motion control applications. This sensor, specifically designed by Sensocon Inc., offers accurate digital output for differential pressure measurements. With its AC current type and advanced Opti-Link digital technology, this product is ideal for precise control and monitoring in various industrial settings. Please contact with questions. Thank you for looking.