Abstract: A comparative measuring tool, including: a storage unit; an input device; a measuring device; and a display device. The input device is configured to allow a user to perform function selection, deviation limit setting, and reference value adjustment; the measuring device is configured to capture a relative displacement and transmit the relative displacement to the storage unit; the display device comprises a display screen configured to show real-time data including the relative displacement, deviation limits, and a reference value.

Abstract: A height measurement system includes: a first fixed assembly, configured to connect to an external fixing part so that the height measurement system is fixed on the external fixing part for use; a head plate, configured to move downwards from the first fixed assembly to the head of a user; a second fixed assembly, disposed on the head plate and being movable along with the heat plate; a digital tape measure, comprising a mounting assembly and a tape disposed in the mounting assembly, one of the mounting assembly and the tape head being attached to the first fixing assembly and the other to the second fixing assembly; a memory storing a standard height value of the first fixed assembly; and a data acquisition unit, configured to acquire a first tensile length of the tape when the head plate moves from the first fixed assembly to the user's head.

Abstract: An electronic ruler for pets includes a displacement sensor module; a controller; a display; a first wireless communication module; and a control key. The displacement sensor module includes a tape or reel; the tape or reel is configured to convert a physical length of a pet to be measured into a displacement length through a rotation angle of the tape or reel, and the displacement length is further converted into an electrical signal; the controller is configured to calculate and convert the electrical signal into a length value in a set unit, and display the length value on the display; and the first wireless communication module is configured to transmit the length value to an upper computer, and the control key is configured to set the parameters of the length value and confirm the transmission of the length value to the to the upper computer.

Abstract: The capacitance-grating type digital display measuring tape includes a shell, a tape box, a tape body and a capacitance-grating sensor. A rotatable central shaft is disposed in the shell in an axial direction thereof. The tape box is mounted at one side in the shell close to the back side in the shell by the central shaft. A mainspring configured to pre-tighten the tape box is disposed in the tape box. The tape body is wound and collected in a groove in the outer circumference of the tape box. The capacitance-grating sensor is located in a position close to the front side in the shell. A self-adjusting mechanism is disposed at a position, corresponding to the outlet, on the inner wall of the shell. The self-adjusting mechanism automatically adjusts the speed at which the tape body extends out of or retracts into the shell.

Abstract: The capacitance-grating type digital display measuring tape includes a shell, a tape box, a tape body and a capacitance-grating sensor. A rotatable central shaft is disposed in the shell in an axial direction thereof. The tape box is mounted at one side in the shell close to the back side in the shell by the central shaft. A mainspring configured to pre-tighten the tape box is disposed in the tape box. The tape body is wound and collected in a groove in the outer circumference of the tape box. The capacitance-grating sensor is located in a position close to the front side in the shell. A self-adjusting mechanism is disposed at a position, corresponding to the outlet, on the inner wall of the shell. The self-adjusting mechanism automatically adjusts the speed at which the tape body extends out of or retracts into the shell.