FITC is still the most popular fluorescent labeling dye for preparing green fluorescent bioconjugates. However, most of commercial FITC labeling kits require intensive hands-on time. This FITC ReadiLink™ labeling kit essentially only requires 2 simple mixing steps without a column purification needed. The kit provides all the essential components for labeling ~2x50 ug antibody. Each of the two vials of FITC dye provided in the kit is optimized for labeling ~50 µg antibody. This FITC protein labeling kit provides a convenient method to label monoclonal, polyclonal antibodies or other proteins (>10 kDa).