OK, I got my last week and have used it once in the field. I have a post at the end of theread about the Pistol Probe Video someone did. It details my thought so far.
I dont have my manual handy but I just fired mine up after reading your post. One of the knobs allows you to set it on one of 4 modes
Always on
Hi
Lo
LED Only ( by inference, "silent")
LED lights ONLY in the LED Mode. Mine does not lite when you are in one of the audio modes. Don't know what the manual said.
Mine air tests a solid 6 inches ONLY if you are pointing the tip at the metal object. If you come in from the side of the probe, the range is NOTICABLY reduced to maybe "3 inches". Try setting threshold to just the right spot to get maximum range and experiment in the air, pointing probe at target and come in slowly from about 10 inches towards the target and you'll get your 6 inches. Then try it again using the side of the probe remembering that only the first 3 inches or so (I forget exactly) is actually sensitive. You'll notice that range is much less coming towards target from side of probe. Good pick up on that ... I had not noticed or thought to look at.
I can't explain the difference in the detection range when comparing pointing at the target vs detecting to the side. Someone on this forum or someone from DetectorPro may be able to explain this. Be sure to find my message on the other thread with my comments about the probe. Granted, I've only used it once but I am still figuring out how I feel about it.
Of course air tests are just that, "air tests". Real life is a different story.
I will post more updates , hopefully get a chance to use it again this weekend. I hate winter and early sunsets.
Opticman