The Close Focus (CF) option lets you accurately measure very small areas at the focus point – where the IR beam narrows. Paired with the advanced coaxial laser sighting system, extremely small objects 6 mm (0.24 in) at 300 mm (11.4 in) can be easily measured. Ideal for electrical maintenance and refrigeration troubleshooting.  Close Focus version for specialized applications, such as electrical components, features minimum measurement diameter 6mm (0.24") and Distance to Spot (D:S): 50:1.