2) Hygrometer: Measure for ambient relative humidity
3) LED light: Lighting(Replaceable battery--step to battery
a)take out the magnifler and ruler.b)loosen three screws.c)change battery
4) Reflector: Call for help in countryside，reflect sunlight to sent out the light signal.
5) Spirit level: Determine level condition
6) Compass: Measure for magnetic azimuth(relative functions of compass:acquire data at horizontal and verticall level)
7) Whistle: Call for help in countryside，sent out the sound signal.(use tappet to push out the whistle from the third hole the left side)
8) Flint: Wilderness Survival by make fire.(use tapple to push out the flint from the second hole at the left side)
9) Magnifier: Find a coordinate on a map
10) Ruler: Measure a distance
* Description:
1) Material: ABS
2) Dimensions: 75mm x 40mm x 25mm
3) Weight: 70g
