A tool that installs a metal tie is disclosed. The housing is configured to removably couple about a load line of a lifting device. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls. 5 microns under the room temperature, an optical system configured for collecting light and focusing the collected light onto the photodetector, and a spectral filter located in an optical path of light propagating toward the photodetector.