Touching it will definately give you a good idea of how hot it is and I agree with the other posts. I have found that most burns are a result of a very hot basking spot combined with low ambient temps. This is usually caused by too much ventilation (screen tops for ex.) This forces the reptile to try and heat up by spending too much time on the basking spot. Another common problem in this type of system is dehydration. Basically this design forces the reptile to burn itself in order to heat up. Most reptiles don't want to sit on the basking spot for an extended period unless we force them to.
I'm certainly no expert but I've had friends cause thermal burns on some of their reptiles and too much ventilation is usually the culprit. Don't quote me on this but some people use extremely high temps for basking spots on some lizards. I believe it was over 150F. I've never actually used a temp that high but I do use around 130F on bricks for my bearded dragons. I've been doing this for about 3 years and have never had any burns. I do give them a few choices for temps and despite the bricks being very hot to my touch, they sit on them for around 10min after they eat.