Accutrak Ultrasonic Leak Detector VPE Standard Kit Easily detects any gas that generates ultrasonic sound during flow, including vacuum leaks. Capable of detecting leaks equivalent to 1.5 oz/year of refrigerant. Visual output of 10 bar chart elements. Audio output 0Hz to 4kHz natural sound conversion. The AccuTrak VPE Standard Kit offers literally double the functionality of the basic kit with the addition of the AccuTrak Touch Pro.be and Waveguide. Using the touch probe, the VPE can troubleshoot thermal expansion valves in less than 5 minutes and find faulty steam traps in just seconds. The touch probe can also be used to detect worn bearings and faulty valves. With the Waveguide accessory, a technician can gain better access to hard-to-reach places and better determine the location of leaks that would otherwise be inaccessible. This is the most popular kit for a reason. The patented Superior AccuTrak VPE is a state-of-the-art non-invasive leak detector that can detect pressure and vacuum leaks of any gas. The AccuTrak VPE is ideal for detecting leaks in air conditioning, refrigeration, automotive and other systems. AccuTrak is extremely sensitive to the ultrasonic sound of a turbulent gas leak. Using a technology called heterodyning, it translates sound to a lower frequency that your ear can interpret. The technology maintains the original sound characteristics, allowing leaks to be distinguished from other competing background sounds. The color is so sensitive that you can actually hear a flicker, but most background noise wont interfere with detection accuracy. How are VPE kits different? The following is an overview of what is included with each. VPE Basic Kit VPE Leak Detector Earphone Battery Hard Case VPE Standard Kit VPE Leak Detector Earphone Battery Hard Case Touch Probe