Sun Company Outsider - 4-in-1 Survival Multi-Tool | Compass, Thermometer, Whistle, and Fire Starter in a Compact Zipper Pull | Outdoor Gadget for Backpacking, Camping, or Survival Situations

I only bought it for the thermometer but glad to have each tool. The whistle is a little weak and probably better off just using your mouth. Thermo seems to be accurate, flint and steel makes a sweet spark, and the compass is spot on. I'm a numbers guy so having the temperature is very important for me especially testing sleep systems and knowing where I'm comfortable in what arrangement. I would definitely recommend this to others. (22 grams with key chain, if that helps anyone)

Pretty handy for a zipper pull, or to turn into a neckerchief slide for Scouting (which is what I did). The whistle is completely useless, though.

The thermometer was tested in two separate freezers and two separate refrigerators to assess operating temperatures. I'm satisfied it gave me reliable readings, after which it conformed to room temperature readings inside my home taken from another unit. It is quite sensitive to the heat of your hand. Compass is very small and will get hung up if not level. The ferro rod and the striker are quite small for my large hands. One could easily fumble and lose the striker in the field. The whistle operates with gentle blowing only, not strong or hard. It's a nice little backup for the glove box of the car or attached to a jacket zipper on a hike. It's not meant to be a primary.

Had an item something like this before, about the same size and form factor, but with just the thermometer and compass. The addition of a fire starter and whistle sounded intriguing, so I ordered one. Pros: -It has a thermometer, compass, and emergency fire starter. It also has a whistle, but see the Cons below. -The serrated edge striker works well with the ferrocene rod. I was surprised how far it throws sparks. -It's compact, battery-free, and low-tech. Don't underestimate the value of having an ambient temperature reading without having to reach for a phone or other electronic device. Cons: -The whistle is a joke. When you blow, it does emit a tone, but much too high pitched and too low in volume to be heard. Might attract dogs, but useless to signal for help. Maybe it's a special frequency for rescue dogs? -Both the ferrocene rod and the striker contain iron and therefore attract the compass. You need to remove both to avoid interference. The metal split ring does not attract the compass. -If this is jolted around enough, for instance on a keychain, the thermometer liquid may separate into parts, like any other spirit-filled thermometer. To fix it, submerge it into a coffee mug of hot (> 120 °F) water. Make sure to keep it upright. -The compass does not have a correction for magnetic declination. This is to be expected for a compass of this size. Moreover, this is not intended to be your primary compass. Verdict: Of the four devices that it boasts, only three are functional. Nonetheless, this is a great, low-tech device to use for backup. Hang it on your pack.

I bought this for the thermometer and compass. I thought perhaps having a fire starter isn't bad either. The compass isn't accurate though. It gets stuck and doesn't move when you move around. Also the thermometer never changed temperature. I was hiking in 35 degrees, and the thermometer said 55. It never said anything other than 55 the other 3-4 times I used it, all of which had different temperatures out. The whistle also doesn't work well either.