The Baumer FHDK 20N6901/S35A is a miniature proximity switch manufactured by Baumer. It is designed for use in a wide range of industrial applications, such as monitoring positions and movement of parts in automated machinery, and can be mounted within tight access constraints. It has a sleek, compact design and features a 35 mm diameter threaded housing, which increases the usability in applications where space is an issue. The sensing range is also highly adjustable, allowing it to detect objects from as low as 6 mm up to 15 mm away. With an IP67 rating, the switch is protected from dust and water, making it suitable for use in harsh or outdoor environments. Additionally, the FHDK 20N6901/S35A is shock and vibration resistant, providing reliable sensing performance in industrial settings.