Buoyant1
Contributor
I use these:
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They are made from a cellulo-organic material which is known for its depth compensating properties. Specially designed, these precision writing instruments are of hexagonal cross-section in order to accommodate divers wearing a range of gloves. The active ingredient in the instrument is a polymorph of elemental carbon, specially imported from the country of New Hampshire. Each instrument is coated with a patented substance known as "yellow paint" to allow the instrument to double as a signaling device - either at depth or at the surface. You'll notice that the image I've posted above is a purpose-built piece of Hogarthian tech gear; easily identified by the lack of a critical failure point that is commonly seen in recreational pencils:
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Plus, you'll also notice the model I use has no wireless transmitter, no switches to fail, etc.
Now, you may say "But Ray, isn't a pencil a life support system?" And of course you'd be right to ask that question. You'd sound like a bit of an alarmist nut, but you'd be right. Either way, I do worry about redundancy for anything that holds my life in its hands (if it had hands) so I always carry an appropriate backup...
Some folks may opt to carry a SparePencilTM...
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but I believe that something that was originally designed to carry just enough graphite to enable helicopter pilots to write "Oh sh-t!" before drowning has no place in tec diving! That's why in cases where you REALLY need redundancy many recreational divers opt to sling one of THESE as backup...
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On the other hand, hard-core tec people like myself will often "dive doubles"...
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which are perfect as this configuration allows you to completely isolate one pencil in the event of a "catastrophic" failure...
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Whatever backup system you choose ultimately comes down to cost/benefit ratio. Extravagant to own two of these highly specialized graphical communication systems? Perhaps. But I spare no expense when my life is on the line. In fact, I recommend that people don't even buy one of these systems on-line. Sure, LP (LeisurePencil.com) offers their own warranty and lifetime battery replacement, but I like to support my LDS (local dime store) which is an authorized dealer with a factory trained technician on-site. I'm not gonna get caught short before a trip or a big dive and have to send one of these instruments back to the manufacturer for warranty service! And don't make the same mistake I did with my first one. (Don't ask how I know, just trust me... there really AREN'T any user-serviceable parts inside!)
Sure, I pay a little more from my LDS which charged me MAP pricing (minimum actual pencil pricing) of $3.99 for 2 boxes of 144 (remember the tec diver's mantra "2 gross is one, and 1 gross is none!") but they let me try the system out in the pool before buying it, showed me how to set my rig up, and I know they'll stand behind it if anything goes wrong! So, if you want to spend $8 for one super-duper mechanical pencil feel free...or you can get 588 of the instrument that I entrust my life to.
If anyone's interested I can make up a batch, paint them black, and put little blue H's on them, however that version is $27.50 each.
:shocked2:
You're a sick sick man!!!

(btw...I just steal them from golf courses by the handful)