Outdoor 10 In 1 Survival Military Camping Hiking Compass Tool Kit Combination Kit Multi Function Professional Compass Tools New|Compass Component: 1.Thermometer:Measure the environmental temperature(minus 20 to 60 degrees Celsius/minus 4 to 140 degrees Fahrenheit) 2.Hygrometer:Measure the environmental relative humidity 3.LED light:A helper at night. 4.Reflector:Refect the sunshine to let out the bright signal 5.Level:determine level condition 6.Compass:measure for (magnetic) azimuth (relative function of compass acquire data at horizontal and vertical level) 7.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) 8.Magnifier:find a coordinate on a map 9.Ruler:measure distance Specification: Material:Plastic Theme:Sports Sport Type:Camping,Hiking Dial Displa:Pointer Use:Thermometer,Hygrometer,Level Carrying Mode:Hanging Ring Type,Handheld Type Outdoor Activity:Camp Power Supply:Battery Replace the battery: 1.Open the magnifier and ruler 2.Unscrew 3 screws 3.Replace the battery