SICK WTT12LC-B2553S25 Laser distance sensors. SICK WTT12LC-B2553S25 is a laser distance sensors in the WTT12 PowerProx family. SICK identifies this exact configuration as manufacturer article 1117934. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression, Optical time-of-flight, distance value; Housing design (light emission): Rectangular; Sensing range max.: 50 mm ... 2,200 mm 1); Sensing range: 70 mm ... 2,200 mm 2) 1); Measuring range: 50 mm ... 1,800 mm 3). The linked SICK data sheet is specific to WTT12LC-B2553S25.