Check the listing for details. allsun Pro Ultrasonic Leak Detector& Transmitter HVAC Automotive Electronic S.... Condition: New. Listed at 192.36 USD. Brand New allsun Pro Ultrasonic Leak Detector& Transmitter HVAC Automotive Electronic Stethoscope Engine Diagnostic Machine Noise Monitor 36-44KHz Air Gas Water Dust Leak Pressure Vacuum Tool Manufacturer model: ULTRASONIC TECHNOLOGYUltrasonic Leak Detector& Transmitter uses ultrasonic sensing technology and features small size and light weight. It is reliable and easy to use and is a practical,portable tool.WORKING PRINCEPLEallsun pro Ultrasonic Leak Detector,turbulence created by gas or air forced through a small office generates ultrasoncic sound. Ultrasonic sound occurs when the atmosphere leaks into a vacuum vessel or when a pressure vessel leaks to the outside atmosphere.FREQUENCYElectronic Stethoscope, ultrasonic sound's frequency is related to the size of the orifice which ultrasonic sound passes through, but usually the frequency is about 40kHz. Frequency Response: 36kHz-44kHz.WIDELY APPLICATIONUltrasonic Air Leak Detector, machine Abnormal Noise Detect; By using this instrument, you can quickly and accurately locate leaks in any pressure and vacuum system. Suitable for detecting cracks of pipes, valves,oil tank and other sealed compartment.WHAT YOU GETEngine Diagnostic Electronic Stethoscope package includes, Leak detector; Ultrasonic probe; Ultrasonic microphone; Ultrasonic TRANSMITTER; Extension tube; Probe tips,70mm and 290mm; Headphone(with volume adjuster). Description Shipping and Handling Please allow 5-7 business days for the package to arrive, regardless of buyer location within the US. We will provide an online tracking number to you once the item has been shipped. It may take a few business days for our automated system to process the tracking number onto eBay. However, this will not affect the shipping times. Return Policy All our products are brand new and sealed. All items qualify for returns within 30 days of receipt. Feedback We take our reputation seriously. If you have any questions or concerns, please contact us and we will respond back to your message within 24 hours.