e36racerx
New
I use a boltsnap. Not loud and very reliable
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Tank bangers are cheap, fairly durable and do the job for me.
Richard.
This...Nothing. Proper buddy technique means we don't need gimmicks like tank bangers, noisemakers, or air horns that annoy other divers and scare marine life. If you need to you can tap on your tank with a knife or other hard object. But if you find yourself doing this on a regular basis you and your buddy need to work on your buddy skills.
A light is a good device. Quiet, easy to see at night and in low vis, and does not annoy others or the fish.
On another note as a newer diver you should never be far enough away from your buddy to need a noisemaker to get his/her attention.
However, if he didn't the hammerhead might have come closer to have a better look at what kinda weird fish was splashing about...Noise makers have there place, I appreciated the other diver who alerted everyone when the great hammer head was circling, but too often noise makers get used for too insignificant or mundane reasons, such as ooh another lobster, looky looky!