LC connectors have a 1.25 mm ferrule as apposed to the 2.5 mm ferrule found on SC and ST connectors. This means you cannot use any of the standard tips that come with the FiberInspector to measure LC connectors. You will need these optional tips:
For testing LC patch cords:
Model name: NF368 Part number: 2787780 Description: 1.25MM UNIVERSAL VIDEO PROBE ADAPTER TIP FOR MALE ENDS
For testing LC patch panels*
Model name: NF362 Part number: 1614311
Description: 1.25MM LC VIDEO PROBE ADAPTER TIP
*If you put an LC coupler on the LC patch cord, you can use this adapter to test an LC patch cord as well.