Gradation Heat-Sealing Instrument is used to test the sealing parameters at five temperature points of laminated films, coating paper and other heat sealing laminated films at the same time. The seal parameters include heat seal temperature, dwell time, and the pressure of heat seal. Melting point, heat stability, fluidness, and thickness of heat seal materials make heat seal properties with different seal technique. Steady seal pressure, accurate dwell time, and 6 dwell temperatures of RTD-R1 Gradation Heat-Sealing Instrument enable users to get best heat sealing parameters. It characteristics include LCD displays data enables direct and clear glance, 6 independent P.I.D. temperature control system, high in accuracy, little fluctuation, gradient temperature setting, convenient and rapid test, system adjusts P.I.D. parameters automatically according to the situation, dispense with the manual change and long service life. Easy in pressure adjusting and high in accuracy. Dwell time is subdivided by micro-computer, high in timing accuracy and best pneumatic elements, steady and reliable performance. It has considerate design, friendly human-equipment interaction.