Economically priced! Get the same great ultrasonic listening quality in this nice, compact instrument for hundreds dollars less than the competitor's models. This VPE model out sells all our other brand name models by a 2-to1 margin. Now, an ultrasonic listening instrument that almost anyone can afford - You'll only hear the sounds emanating from the equipment being tested, NOT from downstream or downline sounds. Your instrument also comes with a CD audio "The Sounds Steam Traps Make." You'll know what sounds mean trouble and what sounds are good!