Ultrasonic Leak Detector, Includes Carrying Case, Detector, Headphones, Touchprobe & Waveguide Attachments, Digital Display Screen Type LED, Product Type Ultrasonic Leak Detector, Display Type Digital, Maximum Frequency Response 42 kHz, Maximum Locating Distance 30 ft, Minimum Frequency Response 36 kHz, Minimum Locating Distance 20 ft, Testing Functions Air Leakage, Gas Leakage, Refrigerant Leakage, Vacuum Leakage, Minimum Acoustic Measurement -80 dB, Batteries Included Yes