Geek Toolbox

I've been meaning to start a list of stuff that any self-respecting geek will have in his or her toolbox when out exploring in the world. These criteria are intentionally broad, and I don't want to limit the list by any specific constraint, such as weight, mass, or purpose.

• A wristwatch. Although many devices these days think they know what time it is, it's good to have a low-tech device that you can trust.
• An alarm clock. Most cell phones have a built-in software alarm clock, but they do you no good on a three-day camping trip after their batteries run out.
• A multimeter. Nothing too fancy; just enough to test voltage, continuity, and maybe resistance, any of which might restore your sanity in a flash when you can't tell which of several parts of a contraption is broken.
• Zip-ties. Get some big ones and a lot of small ones.
• A sledgehammer. I'm very happy with this one. Much better for ad-hoc pounding or smashing than a piece of wood or a soon-to-be-never-the-same-again book.
• A few dozen feet of rope as well as knowledge how to tie at least one good knot. For most purposes, this is just as good as tie-down straps or aircraft wire. A couple carabiners are nice, too, but not essential.
• A cigarette lighter. Or strike-anywhere matches, your preference.
• A pair of multi-purpose shears.
• Several different sizes of bungee cords.
• Sunscreen.
• A towel.
• A compass, or at least some very basic knowledge about which way is North.
• A power inverter. As long as you have a car nearby, you'll also have AC power. Just be careful about wattage, or else you'll soon have neither.
• Duct tape.
• An LED headlamp. This one is my all-time favorite because it has night-vision red, reasonably bright white, and a third Krypton mode if you need extremely bright or more natural wavelength light.
• A high-intensity utility light. I wouldn't bother with rechargeable models; if you don't have AC power, either wait until daytime or use a headlamp.
• An adjustable wrench. You'll curse yourself for not bringing a full socket set, but it's better than nothing.
• Work gloves. You can do anything once without gloves, but once might not be enough.
• Earplugs. Preferably a bunch of individually wrapped pairs, so you don't have to reuse an old pair with unknown history.
• Safety goggles.

I have purposely excluded various useful electronic devices (cell phone, laptop, GPS, scanner radio, portable printer) because they tend to be unavailable at any distance from civilization. They tend to need a battery recharge just when you need them most, as well.

Did I miss anything?