The E39-F9 is a miniature low-cost, waterproof inductive proximity sensor manufactured by Omron. The E39-F9 is a cylindrical device with an outer shell made of PBT plastic and a stainless steel sensing face. It has a sensing range of 6 mm and operates on 12 to 24 VDC. The E39-F9 features a sensing frequency of 1 kHz and a response time of 1 ms. Additionally, it has a mechanical life of up to 30 million operations and electrical life of up to 10 million operations. The E39-F9 has an IP67 rating, making it suitable for applications with exposure to dust and water.