Proximity Sensor is a probe-style inductive sensor for use up to 0.2" (0.5 cm) from a 0.5" (1.3 cm) diameter metallic target.
Magnetic Sensor with amplifier is for use with 60 tooth, 20 pitch gear.
Remote Optical Sensor is a stainless steel sensor with visible red LED light source and green LED on-target indicator. For distances up to 3 ft (1 m), up to 45° off center from reflective target.
Infrared Sensor is for use with or without reflective tape at 0.5" (1.3 cm) sensing gap from target. Senses white to black contrasting marks, or beam can be interrupted by solid objects.
Remote Optical Laser Sensor is ideal for a wide range of applications where distance to target is large.

This remote optical laser sensor has a speed range of 1-1,000,000 RPM and is 0.625" x 2.90" (16 x 73 mm).