For fabric/neoprene you could use "scuba goop".
Google for it. It is sold in many fluo colors.
For smooth surfaces you can buy stickers with personalized printing on it.
There are special stickers, sold by the sheet on eBay, they lasts many months when attached on a clean surface.
I usually read instantaneous values for the depth - I wear a Perdix, a Suunto HelO2 and sometimes a D6i also and their readings change simultaneously.
I never changed the default sample rate that is what recorded in the log. I can also say that, the max depth, even if recorded in the summary...
True it is the best product, but here, in EU it costs less than 6 or 7 € (no shipping if you have Amazon Prime).
You should buy this one instead ;-)
Some titrate from the golden-ratio to pi (squared) should be good enough for every dive in the northern hemisphere.
I apologize for those who dive south, they should find out the best proportion in a trial and error trail.
I had, once, a buddy who used his spit and it worked flawlessly, but I...
It sounds weird to me that just 1 foot less goes from being too long to the short side.
Anyway there are places where you can obtain any length you ask for, so try to figure out the desired size and go for it.
I think the device suffers from bad advertising...
Think at it as a bottom timer with air integration ... and to be more versatile it could just have a way (button) to reset the average depth and more divers could also be interested.
And now: a bottom timer with user replaceable battery with...
I'm the second one who bought one Cressi Digi 2 spg.
The cover plate has a small magnet on the bottom right corner that is necessary in case you want to change from metric to imperial units.
In that case you do not need to pressurize the spg.
You can also use any small magnet for the purpose.