I would just simply use temperature control:

The Shine Therapy hair straighteners from Remington have ionic ceramic plates that release a blend of vitamin E and conditioning agents onto your hair as you use them - keeping you moisturised and looking great. These vitamin-infused plates have been tested and are guaranteed to last for over 40,000 uses - around 5 year's worth of straightening. With a floating-plate design to allow even pressure to be applied on the hair, these straighteners also feature a 60-second heat up time, heat boost and temperature lock functions, auto shut off after 60 minutes and a digital variable temperature control between 150ºC - 230ºC with an LCD display. These stylish Remington hair straighteners come in white and also have a cool tip for safe hold and control while styling.