An apparatus for testing label-liner separation is provided. The apparatus comprises a roller, a plurality of replaceable printer peel bars, and a weight. Each peel bar associated with its own unique radius for its disengage edge. A label-liner web is fed under the roller and up to a given peel bar of a given radius over the corresponding disengage edge. A string is attached on one end to a liner portion of the web and the weight is attached to the other end of the string with the weight freely hanging unsupported under the liner portion. A label portion of the web is pulled over the disengage edge to determine whether the label portion separates from the liner portion of the web during the pulling. If no separation occurs a different peel bar with a different radius is selected and tried. This repeats until separation is achieved.