The RPI-352 photointerrupter from ROHM is a 3mm optical switching element designed to provide precise signal switching and detection in a range of optoelectronic systems. It features a transmissive type phototransistor output with a 4.2x5.4mm gap. This device is ideal for applications that require an ultra-compact, precise, and reliable photointerrupter. The RPI-352 can be used to detect a range of signals including wear resistance, counting, and timing.