No. Tidal gauges only measure water levels.
Depending on how long you have had your ear stretched to a 0'.. If you have had it for years then it's unlikely it will close back up completely, but it the hole is fairly new, a year or so, then it will close up. It all depends on the healing process of your body. Everyone is different.
Yes, stretched ears can shrink up. How much you can get them depends on your body, how old the stretched are, and what size. The general point of no return is 2ga. Meaning that you can shrink up pretty small at 2ga but beyond that, you wont be able to get back down to 18ga/16ga without getting them professionally sutured.
Gauges are generally tuned to tension on wires, if they gets tweaked the gauges can easily become faulty.
All gauges will shrink if they are not completely healed. If you take them out before they are healed and leave them out for long enough, they will close completly. They may shrink a bit if they are relatively new, but you should always save your used tapers in case that does happen. Be sure to never skip a size in gauges, or it could heal the wrong way and close up faster. If the 00 gauges are fairly old, a single day couldn't do much harm, as long as you put plugs or tapers back in to keep them from shrinking more.
No hammerhead shark skin is not used for sandpaper, dont know how you came up with that theory
Ear gauges can indeed close. I have head several stories about peoples' ear gauges closing over time, some even being near size 00. Ear gauges can close over time if you don't wear a plug or tunnel in it. If the gauge is small, it will take less time for it to close, unlike BIG gauges - which could take around 2 months. One secret is to rub hemerroid cream on your ears about twice a day first your ears will swell but later when your lobes go back to normal the holes will be smaller. However, if your ears were gauged above a 00, they will never close entirely without surgery, which currently runs about $800 an ear.
yepp :) that's what happend to mine
Some sanders have a dust extractor or vacuum connection. The holes in the sandpaper allow the dust to be sucked up and away.
Sand, paper and glue.
Streamlined scuba is just a term used for a diver who has all their gauges and equipment close to their body so they are not harming the environment around where they are diving. Commonly clips are attached to the BCD for easy access to gauges while keeping them close to your body.
0 ~ 00 are the points of no return. Once you have reached these gauges that's it the piercing will not close, however it will shrink down if the jewellery is removed but it will never be the way it was before stretching. Surgical intervention is needed to repair the damage.