... killer, car's heater, humidifier, de-humidifier, heating-plate, massager, physical therapy machine, hot glue-gun, hair crimper, hair straightener, coffee ... if the surface temperature on end product was under 260°C. 3. Notice in appliance.1) The surface temperature on ... impossible. 7) The surface temperature increases (or decreases) about 8°C, when supplied voltage increases (or decreases) 2 time. 8) ...