Top 10 Best ultrasonic leak detector in 2026

Main highlights

• •Heated Diode Sensor: Compared to traditional sensors, the results are also more accurate for all halogenated refrigerants.
• •TFT Screen: First leak detector with a TFT screen that gives more clear and easy readings on sensitivities, leakage alerts, battery levels and other key info during operations.
• •Higher Sensitivity: Adjustable sensitivity with High/Medium/Low levels and the maximum sensitivity is up to 0.1oz/yr.
• •Quick Operation: The two corresponding buttons on the front allows quick adjustment to sensitivities or to mute buzzer directly, very easy to operate.
• •Detecting All Halogenated Gases: It can detect all kinds of halogen refrigerants including CFCs, HFCs, HCFCs, HCs, HFOs and mixed refrigerants such as R11/R22/R404a/R410a/R600a/R1234yf and Blends such as AZ-50, HP62, MP39 etc. and response within 1s. We offer 7*24 services and a one-year warranty for the gas leak detector.

Main highlights

• •Detects pressure and vacuum leaks for all gases
• •Hear the leak using the included headphones
• •Works even in noisy environments
• •Laser pointer makes it easier to pinpoint the leak
• •Applications include pressure/vacuum leaks, electrical arcing, malfunctioning steam traps, and more
• •Only technology to detect pressurized nitrogen leaks
• •Runs on two D-cell alkaline batteries
• •Rugged carrying case included
• •Made in the United States, US Technician Support via Email and Phone

Main highlights

• •Ultrasonic Technology: This ultrasonic leaking detector is a practical and portable tool that uses ultrasonic sensing technology. Its small size and light weight make it easy to use and reliable.
• •Working Principle: Water Leaking Detector Tool,Gas or air forced through a small orifice creates turbulence, generating ultrasonic sound. This sound occurs when there is a leak in a vacuum or pressure vessel, which can be detected using this instrument.
• •Frequency Response: Ultrasonic Leaking Detector hvac, the frequency of ultrasonic sound is related to the size of the orifice it passes through, typically around 40kHz. This detector has a frequency response range of 36kHz-44kHz.
• •Wide Application: Electronic Ultrasonic Test Equipment, suitable for detecting leaks in any pressure and vacuum system, including pipes, valves, and oil tanks. Can also detect cracks in sealed compartments. A must-have tool for detecting machine abnormal noise.
• •Included Accessories: Water Detection Device, Comes with a leaking detector, ultrasonic probe, microphone, transmitter, extension tube, probe tips in two lengths, and headphones with a volume adjuster for convenience.

Main highlights

• •Advanced Ultrasonic Detection Technology Professional-grade leak detector utilizing 38-42kHz ultrasonic waves to pinpoint microscopic leaks in air, gas & water systems. Compact design with small size and light weight ensures reliable performance in harsh environments. (Includes noise-isolation headset)
• •How doe it work? Water Leaking Detector Tool, Gas or air forced through a small orifice creates turbulence, and then generating ultrasonic sound. This sound is made when a vacuum or pressure vessel leaks, which can be detected using this instrument.
• •Multi-Industry Application Ideal for automotive diagnostics, HVAC maintenance, industrial pipeline inspection, and pressurized tank testing. Effectively detects vacuum leaks, valve failures, pipe cracks, and abnormal machinery sounds across multiple systems.
• •Smart Sensitivity Control Features simultaneous LED light indicators and adjustable audio alerts. Proximity sensing technology increases alarm frequency as you approach leak sources. Adjustable sensitivity allows customized detection ranging from near to far. Built-in frequency filter eliminates ambient noise interference for accurate readings in busy workshops.
• •Complete Leak Detection Kit Comes with: (1) Ultrasonic scanner unit, (2) Noise-canceling headphones, (3) Storage case, (4) 9V battery, (5) User manual.

Main highlights

• •【Quick Leak Location】Ultrasonic leak detector adopts advanced ultrasonic sensing technology, which is specially used to detect the leakage of gas, liquid, etc. Air leak detector can quickly and accurately find gas or liquid leaks in various pressure or vacuum systems. Ultrasonic leak detector can be used to detect the tightness of cabins, car cockpits, refrigerators, containers, etc., and can also be used to track and locate leaks in doors and windows, pipes, tires, and refrigeration equipment.
• •【High Sensitivity Sensor & Adjustable Sensitivity】Ultrasonic leak detector adopts advanced high-quality sensor with high sensitivity, which can respond quickly and detect tiny leaks, providing you with stable and high-precision detection. The sensitivity of the ultrasonic air leak detector can be manually adjusted according to the detection environment. Adjust to the required sensitivity, the measurement accuracy will be higher (Frequency Response: 40KHz ± 2KHz).
• •【Sound & Light Dual Alarm Prompt】When ultrasonic waves are detected, the LCD indicator of the ultrasonic leak detector will light up, and ultrasonic leak detector will issue rapid ticking sounds to remind you at the same time. Our ultrasonic leak detector comes with a headset that quickly captures the location of leaks with even the tiniest of sounds. The closer the probe is to the leak, the faster the frequency and the higher the pitch of the ticking sound in the headset.
• •【420MM Flexible Probe&Foldable Headset &Portable Handbag】The probe of ultrasonic leak detector is 420MM long and can be bent at will, so the position of the leak can be easily accessed and detected even in difficult and hard-to-reach areas. The headset has a foldable design, compact and easy to store. Air leak detector comes with a handbag, which is convenient to carry around. Note: The ultrasonic air leak detector is powered by a 9V 6F22 battery (not included).
• •【2-Year Warranty】We aim at trying our best to offer you the best product and services to make you unworried before/after the purchase. We promise a 2-year warranty. If you have any questions or doubts, our professional technical team will help you solve the problem within 24 hours.

Main highlights

Main highlights

• •Includes: Whisper, Premium headphones, Metal contact probe, Whisper Transmitter, (with battery), Rubber extension probe, Two D-size alkaline batteries, Rugged carrying case
• •Detects pressure and vacuum leaks for all gases
• •Hear the leak using the included headphones
• •Works even in noisy environments
• •Laser pointer makes it easier to pinpoint the leak
• •Applications include pressure/vacuum leaks, electrical arcing, malfunctioning steam traps, and more
• •Only technology to detect pressurized nitrogen leaks
• •Runs on two D-cell alkaline batteries
• •Made in the United States, US Technician Support via Email and Phone

Main highlights

• •Operation Modes for Diverse Applications: Professional ultrasonic leak detector, Widely Used in HVAC & Automotive. EM282-R features both Active and Passive modes. In Passive mode, it can be used alone to detect leaks in pressure and vacuum systems. In Active mode, combined with the EM282-T transmitter, it can perform tightness checks on non-pressurized containers and sealed compartments like cars, ships, and refrigerators, offering a wide range of applications. Also it doesn't work for low pressure.
• •Precise Leak Location for Efficient Fault Detection: Dual LED & Audio Alarm, Utilizing advanced ultrasonic sensing technology, the detector can identify ultrasonic emissions caused by gas or liquid escaping through tiny openings. When the probe approaches a leak, the "LEAK" LED lights up and the ticking tone in the headphones increases in frequency. The higher the frequency, the closer you are to the leak, allowing for quick and accurate location of the problem.The sensitive sensor picks up the 40kHz ultrasonic sound. The "LEAK" red LED lights up and the ticking alarm in the headphone increases frequency as you get closer to the leak, helping you pinpoint the exact location.
• •Portable and User-friendly Design: Automotive ac leak detector is compact and lightweight, the EM282-R is easy to carry and operate. Simply plug in the headphones, press the "TEST" button, and adjust the sensitivity knob according to the environment. No complicated training is required, making it accessible for users to perform detection tasks on-site.
• •High Sensitivity for Reliable Detection in Various Environments: The air leak detector can be set to the highest sensitivity level to capture even weak ultrasonic signals from leaks. In noisy conditions, the sensitivity can be adjusted to filter out background noise and ensure accurate detection of leaks, providing reliable results.
• •Durable and Low Maintenance: HVAC Leak Detection is built with a sturdy structure, the EM282-R is resistant to damage and can operate in temperatures ranging from 0℃ to 40℃ and humidity levels below 80%. Output Frequency :40kHz. Powered by 2 pcs 9V 6F22 battery, it offers easy replacement and stable performance. With a recommended battery change after 10 hours of continuous use, it ensures low maintenance costs and long-term reliability.

Main highlights

• •20 kHz to 90 kHz frequency range: Optimal range for detecting a variety of leakage events
• •2.5” LCD display with bargraph
• •Sensitivity and volume controls
• •Portable Earbuds (for use with hard hat)