A tool for applying grout into a recess between adjacent tile surfaces comprises a body for gripping by the user formed with an elongate, resilient channel member adapted for retaining a line of grout and delivering the grout directly into the recess by aligning and pressing of the channel member over the recess. In particular elevated pressure is maintained to prevent alcohol boil off during initial mixing and reaction of the reactants prior to any catalyst addition, and preferably the pressure is reduced rapidly after the desired reaction temperature has been reached. The bio-optical blood flow detection device is configured to capture microcirculation signals of the surface of the acupoint of the human subject by the optical probe. Further, the method includes comparing the second set of checksums to the first set of checksums to validate that the runtime module deployed on the second system is identical to the first system.