Ultrasonic detectors, the real deal?

Anybody have much experience with ultrasonic grease guns?

At what frequencies do they detect bearing noise? Is frequency even play a part in ultrasonic detection?

Would it be better to purchase an ultrasonic grease gun or just an ultrasonic gun (more uses)?

Our concern is that by the time the ultrasonic detects noise bearing damage may be occuring. I personally would like to try one but, one of our lead vibe guys is skeptical of the whole set up. We are having trouble finding out at what frequencies and db they detect, as related to vibration analysis.

Thanks for any input.
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