A color calibration system includes a visual display terminal, a color calibration sensor optically coupled to the VDT, and a computer processing unit electrically coupled to the VDT and the color calibration sensor. The system identifies a correlated pair of the captures having a positive degree of correlation between the attributes of a respective pair of the network pages. The self-locking hitch pin allows for single-handed installation and securing of a hitch device to a receiver hitch with no pin or locking mechanism to be lost or dropped. The flexible nature of the wire will allow it to generally fill the body cavity to increase the contacted surface area and the amount of cells that are collected.