After the finished stamps to check welded seals using the index finger to the welded seals, using the index finger length welded seals and check point at the point of stamps, postage stamp footprint.
After you're done, check the stamp seal. Using the index finger to the seal. Using the index finger length Sealing cracks and check the stamp on the stamp.
After the stamp is finished, check the seal with finger pointing to the seal. By using the index finger along the length of the sealing and check point at the point the stamps stamps.