What's the best hair straightener for relaxed hair?

i am an african american %26amp; i have a relaxer in my hair


%26amp;%26amp; i have been using the wrong flat irons like the worst %26amp; it damages my hair..so I want to know what is the best hair straightener for relaxed hair like mine?What's the best hair straightener for relaxed hair?
Too much heat on relaxed hair will damage it regardless of the flat iron you use. How often are you flat ironing your hair? Its already straight so why use it often? But the best flat irons are ceramic like Chi, Sedu and Solia.