Popular life tools,including Compass,Flashlight,Flashing lights,Stopwatch,SOS,Theodolite,
Level,Meter above sea level.It can be used for everywhere,everytime,everyone,no only in usual time but also in emergent time.
Compass ,indicates the direction when you are losing;
Flashlight, illumination or finding something in dark place;
Stopwatch.timing for sports or exercises;
Flashing lights,flash someone if he attack you;
SoS,notify others to help you;
Theodolite,display the exact location in earth,someone can find you;
Level,measure the tilt angel of plane;
Meter above sea level,meaure the height of the place or mountain above sea;
Modifcation for stopwatch to optimize the resource occupation.