Series 509 M8 analog sensors from Contrinex Inc., Old Saybrook, CT, have a 0–4 mm sensing range and offer temperature stability between –25°C and 70°C and repeat accuracy. Sensors are available with output voltage ranges of 0–5 V or 0–10 V. Applications include regulated approach to end positions, providing several switch points with a single device, and monitoring concentricity or the detection of vibrations. Sensors are also available in M12, M18, and M30 sizes.