I am using to measure thickness a transducer Krautkramer, model KBA560-D. When Im measuring thickness in steel, from 122ºF to 212ºF degrees, the values displayed increasing with the time. According to the indications of the transducer, it can work up to 250ºF. I believe the problem is the temperature of the transducer varies between measure and measure. I would like to know if somebody had this problem and with what transducer could solve it. Please send me transducer models what correctly operating in this conditions.