UTT meters of various brands can be selected. Like John, I like Krautkramer too and still remember their MIC10/20 UCI Hardness tester I used a decade ago
But for the application one thing to consider is the accuacy of the meter to track the wall loss since degradation/corrosion happens slowly. For example if pipe wall loss is 0.001mm after the last measurement, and the meter can only indicate 0.00mm then there is lack of detection capability. Engineering's specification of min wall thk should be considered for the meter selection. There is so called "Rule of 10" in MSA.