SICK WTT12L-A2563 Laser distance sensors. SICK WTT12L-A2563 is a laser distance sensors in the WTT12 PowerProx family. SICK identifies this exact configuration as manufacturer article 1082474. The official technical record specifies Functional principle: Photoelectric proximity sensor; Functional principle detail: Background suppression, Optical time-of-flight; Housing design (light emission): Rectangular; Sensing range max.: 50 mm ... 3,800 mm 1); Sensing range: 100 mm ... 3,800 mm 2); Measuring range: 100 mm ... 3,800 mm 1). The linked SICK data sheet is specific to WTT12L-A2563.