Electronic scale ruler and vernier caliper, and use method thereof

A method of determining an actual distance using an electronic scale ruler, the electronic scale ruler comprising an input area, a display screen, a plurality of light beads, a vernier base, and a main control board, the method comprising:

• selecting a target unit size type from the input area;
• selecting a scale from the input area;
• sliding the vernier base from an origin to an end along a length direction of the electronic scale ruler;
• recording a measured distance from the origin to the end;
• calculating the actual distance, by the main control board, in accordance with the selected scale;
• and
• displaying the actual distance on the display screen.

A method of determining an actual scale using an electronic scale ruler, the electronic scale ruler comprising an input area, a display screen, a plurality of light beads, a vernier base, and a main control board, the method comprising:

• selecting a target unit size type from the input area;
• sliding the vernier base from an origin to an end along a length direction of the electronic scale ruler;
• recording a measured distance from the origin to the end;
• obtaining an actual distance from the origin to the end;
• determining an actual scale, by the main control board, by dividing the measure distance by the actual distance;
• and
• displaying the actual scale on the display screen.