Outsider

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.

The could do better: The whistle is um quite weak. It works but you can't put full lung power behind it or it snuffs it's own sound out like a candle flame. There's a bulky block that sticks out where the whistles sound chamber is. Its where the company's logo is on the pictures. It isn't to bad just bulky and is hidden by picture angles. The bad: The plastic where the split ring goes through looks like it isn't going to last long, it's a quite thin strip of plastic. The good: The ferro rod works and is very sparky. The button compass is very responsive, both it how fast it tracks back to north and in how much play you have before it gets stuck from not holding it perfectly flat. It's also accurate. No joke this is the button compass you want over all other button compasses. I'm surprised at how there wasn't any crappyness when that's where I'd expected a cheap compass. I'd still buy this again, it's not bad but you can't expect to use it outside your gear as a zipper pull and not expect to find it missing when you might need it. Use it for internal back pack zippers maybe? If that thin plastic strip were thickened up the other complaints are more improvements needed but still a good product, if that thin plastic strip is thickened up. I might see where I could drill a hole through it and see if I can get a better and more durable attachment point.

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)

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.

What can you expect for 12 bucks, so I'm not really super bummed, but the whistle and the flint/steel really don't work at all, so don't get your hopes up. It was actually sort of comical how crappy the flint was since I'm a very experienced welder and mechanic who could barely get a spark out of it using extra tools in my shop. There's no way you're going to get it to work using the steel that came with it, or even a hunting knife. The whistle is just barely loud enough to make someone in the other room maybe look up and say "what are you doing?" Don't expect it to flag down any rescuers. I'm doing a 24 day ultra light weight hike and I was looking for an opportunity to eliminate gear, so I was hoping the 4 components might work; allowing me to combine at least three. The only components that may be good are maybe the thermometer and compass.

Thing is way cool, I use it in the wild hunting vole and albatross. The compass doesn’t work unless you pull out the ferro ROD. Wink wink, nudge nudge! Say! No! More!

My bad for buying this silly thing. The whistle doesn’t work unless you are trying to signal someone 2 feet away. And the firestarter? NO ONE is going to use that thing even if they forgot a lighter. Getting a fire going with flint and steel requires skills that virtually no one has.

The absolute best thermometer i have, and i have several. Usually the thermometers are about 5 degrees off when they are cheap. Not this one, it's absolutely spot on to a single degree.