ALLOSUN Automotive Electronic Mechanics Stethoscope Electronic EAR Diagnostic Device Kit EM410 with Short and Long probe

As a mechanic I can say worth every penny!

This electronic stethoscope is much more sensitive than the conventional manual stethoscope I used before to look for sprinkler valve leaks. Note that it is a contact microphone only. That means that the probe end needs to be in contact with a hard surface on the valve, pipe, or automotive part being investigated. It is purposely insensitive to air transmitted noise to cut background noise. You should turn the volume down while you are making contact to keep from having a loud pop in the earphones. There are two volume controls: One on the earphone cord and one on the unit. Make sure that neither is turned off. I dropped 1 star for two reasons: First, there was no 9V battery supplied, as the product description and package content indicated. Second because the LED does NOT indicate the signal strength as the product description claims. It appears to be nothing but a very bright on/off indicator. Despite these minor discrepencies, it is a very useful product and comes in a well made protective carrying case. I used the stethoscope to figure out which of two valves next to each other had a leak. Even connected to the same supply pipe and only inches apart, it was easy to hear which one had the leak.

A unit that does exactly what they claim. Unlike a stethoscope, this unit has an amplifier built in, so it's easy to hear the sounds. It does the job.

I was trying to hear an air leak in a truck system. This is more of a contact unit. It dous not "hear" ambient sources. The volume is touchy. Didn't really solve my issue.

easy to use

Very Easy to Use and is a great quality for the price !!

At the $50 dollar price point, it works exceptional well...Start with the volume at the lowest setting to establish a baseline, and then increase volume. 9V (not included)The final results on my 01 Tundra 3.4 SR5 making the infamous whining noise was actually the Power Steering Pump itself. I also discovered with the use of this device that#5 cylinder was misfireing.... (Tick, Tick, Tick) Mechanic Joke.. Take Care...

Does the job. Great for plumbing leaks and pinpoint the problem

I have hearing aids. So I needed something to go over my hearing aids ( head phones ).

Received item today. Fast delivery but one small item missing. The battery which make the item work.Package should have been checked before shipment. Another note is that this package was unsealed which made it easy for someone to remove the battery. For that I will only give a 3 star.

Awesome diagnosis tool. A lot better than the regular mechanic stethoscope. Highly recommend it.