I got to buy an flaw detector for my company. We are working with carbon steels and tool steels. We got to apply test after heat treatment. should i buy DIO-562LC or USM35X S. I know USM35X is better, so what i want to ask is, DIO is sufficiently effective for steel testing? DIO is much cheaper than USM. Please dont advise any other FLAW DETECTOR, these are the ones what i got to compare.