Ezyoutdoor T10 Multifunction LED Compass Orienteering Specialist with Flashlight Whistle Enlarge Border Magnifier Hygrometer Flintstones Essential Outdoor Survival Tool 10 functions in a compact kit: thermometer, hygrometer, LED light, reflector, spirit level, compass, whistle, flint, magnifier, ruler. Handy for hiking, camping, spelunking, etc;Suitable for adventurist;Reflector: call for help in the countryside. reflect sunlight to sent out the light singnal Thermometer: measure for ambient temperature (-20--60Degree) ;Hygrometer: measure for ambient relative humidity. Compass: measure for magnetic azimuth (relative function of compass acquire data at horizontal and vertical level) Whistle: call for help in countryside,sent out the sound signal,(use tappet to push out whistle from the third hole at the left side)