Abstract: A checking and measuring system includes a checking and measuring mechanism, and a strength measuring element; the checking and measuring mechanism includes a rail, a moving rod positioned within the rail, a rotating power source connected to the moving rod, a sliding member movably connected to the moving rod and sliding along the rail, a first testing rod fitted on the sliding member, and a second testing rod fixed next to one end of the rail; the strength measuring element is fitted to the second testing rod; when a person holds both the testing rods with one hand, and holds a container containing a heavy metal pollutant with the other hand, with the index finger touching a piece of metal having the same element, strength of his/her hands will be measured, and the amount of the heavy metal in this person's body will be obtained based on results of measurement.

Abstract: A windows-breaking emergency escape device including a main body, a hammer and a supplementary power apparatus, wherein the hammer and the supplementary power apparatus are installed on the main body. The front end of the hammer extrudes from the surface of the main body. The supplementary power apparatus will reserve enough power in advance to lessen an operating force and to release the reserved power to drive the hammer to break the car window when a car accident happened. Moreover, the main body of the device of the present invention includes a groove containing a cutter.

Abstract: The improved plumb-bob is mainly consisted of a body section, a point section, and a fixing element, wherein a connecting means is arranged at the top of the body section by which it may be connected to a suspending cord, and the point section is a cylinder with a flange arranged at the shank, and the point section is provided at least at one end with a conical-pointed part, and the fixing element is bored from the low end to the upper end forming an upper portion and a lower portion. The upper portion is of larger diameter and the lower portion is of reduced diameter but is larger than that of the point section, thus forming an angular shoulder against which the fringe abuts when the parts are assembled to enable the conical-pointed part to project outwardly under the fixing element. The fixing element can hold and fix the point section in a proper position between the body and the fixing element.

Abstract: A windows-breaking emergency escape device which comprises a main body, a hammer and a supplementary power apparatus, wherein the hammer and the supplementary power apparatus are installed on the main body, the front end of the hammer extrudes from the surface of the main body, the improvement comprising that the supplementary power apparatus will reserve enough power in advance by less strength of a user—such as a female user, and to release the reserved power to drive the hammer to break the car window when a car accident happened, moreover, the main body of the device of the present invention further comprises a groove containing a cutter, the width of the groove is smaller than that of a child's finger so that it is safe for the user from being wounded due to carelessness.