allsun Ultrasonic Leak Detector Diagnostic Stethoscope 36-44kHz Air/Contact Probe,Kit w/Rotary Volume,Tone Generator,Find Vacuum Gas Seal Faults,Auto& Industrial Leak Detection Tool

Pinpointed an axle bearing growl with shop radio right next to you. The bearing was barely bad and thought it could be the carrier (in diff) bearing but was axle bearing. This tool nailed it. Been using the Bluepoint microphone for over a decade or more, that thing going in garbage, had better luck with using a hose or screw-driver to pick up noise. Tried to use on injectors but secondary voltage too noisy when that close. But it's awesome away from secondary noise.

Extremely accurate, but can be tricked by the tubes in tight spaces. Try using it without the tubes if there is too much background noise.

I do transport refrigeration and had a hard time finding leaks I’ve used sniffers and bubbles this thing you can hear small leaks undetectable by a sniffer even boost leaks air brake leaks also has frequency transmitter you can check seals with like freezers or back of a refrigerator truck or fridge well worth the money although the light gage is not that sensitive but you’ll definitely hear leaks also has a stethoscope great value most useful tool I’ve bought for my trade

I bought a $650 AccuTrak ultrasonic leak detector for finding refrigerant leaks and was very impressed when I found two leaks that nobody else could find in 5 minutes. Thought that maybe I could get by with a less expensive unit and return the AccuTrak so ordered this. I could sort of hear the two leaks that I had already located, but if I didn't already find them with the AccuTrak I would have not found them with this unit. Could barely hear the leaks over the background noise. This unit also just has a volume control, but not a sensitivity control like the AccuTrak.I understand that I am comparing this to a unit that is 5 times the price, but for what I need it for it really is useless.

I bought these for all of our service techs after the first one help us find a leak in 5 minutes.

Helps me diagnose steam traps. Kind of works, picks up a lot of electronic noise (old florescent lights). touching the contact probe "grounds" it and reduces the noise. Flexing the probe reduces the noise.. I make it work for now.

Super sensitive in leak detection. Great deal especially on prime day.

I am certified many things in hvac and have worked as a Senior Mechanical Engineer, selecting this device for locating leaks was arduous. Filtering through all the reviews that demonstrated they did not fully understand the tech. I understand it enough to have identified leaks as expected. Will you be 10 ft away and find it, only if your pointing the wand right at it. You need to understand where a leak might be, how background noise is sounding and have enough hearing left to identify the appropriate changes in sound the tool makes and it works.