You can get a thermal-reactive film thermometer at most drug and discount stores. They are about an inch wide and three long. They are designed for little kids- put them on the forehead. The only problem is, if you are outside, any chilling of the skin will play with your readings. But I would say, hypothetically, that a reading taken in, say, the armpit would be just as effective.

I know we used to have one around here. I'll see if I can find it, and see if what kind of results I get from using a body location other than the forehead.

There are several companies that sell them, here is one with several made by different manufacturers:
Disposable Thermometers

Pete

You might add a photon type light, a lighter and a small mirror.

Teacher

I don't want non-FA stuff in my kit, so no lighter. However, a mirror would be very handy and a flashlight to, but no photon.
The LED is to bright for testing the pupil-reaction

Great kit! One more thing to consider adding, and it won't take up tons of space: an irrigation syringe (plastic, fill with water, use to flush dirt and debris from wounds - much better than the saline packs or just pouring water on a wound).

I will add one
How large? 2ml, 5ml, 10ml? With or without a needle?

Usually a 60mL/2oz syringe is used for irrigation purposes. Kinda large for EDC.

Oops, without a needle; most irrigation syringes have a long cone shaped tip as opposed to a Luer Lock connection

No needle - usually a removable, sometimes curved, plastic tip. Here are some examples.

12 cc (I have this one but put it only in smaller kits):
http://www.nols.edu/store/product.php?productid=16249&cat=266&page=1

35-60 cc (I have a similar one that goes in my larger group kit - can't remember where I got it, and it has a green curved tip that's a bit smaller than that on these; it develops really good pressure for cleaning out wounds):
http://www.wildmedcenter.com/store.html#syringe

I've used these a fair bit in the field - great for cleaning out scrapes, skinned wrists and knees, and debris-filled cuts. You can improvise with a ziploc bag or hydration bladder, but they don't get near the amount of pressure going that the irrigation syringes do.

PS - a few water purification tablets might not be a bad idea as well, if you're not carrying some elsewhere.

Jim (and others) since I work in an ER I carry 3 sizes 5,10,20cc syringes I also carry IV needles (pop out the needle screw it on and volia instant pressure) the cath is flexable enough to even get into ears for cleaning
Mike