Portable electronic measuring device and method

A portable electronic device for measuring a distance (D1) between two points, the portable electronic device comprising:

• a measuring unit configured for measuring a perpendicular distance (D2) between the portable electronic device and a line defined by the two points;
• at least one visible and rotatable light emitter for generating a rotatable light beam, and a line joining the measuring unit and the light emitter is parallel to the line defined by the two points;
• an angle calculating unit for computing two angles defined by the rotatable light beams targeting at the two points respectively;
• a computing unit for computing the distance (D1) between the two points according to the perpendicular distance (D2) and the two angles;
• and
• an output unit for outputting the distance (D1).

A method for measuring a distance (D1) between two points (E1, E2) comprising:

• a first surface of a portable electronic device is disposed to be parallel to a line defined by the two points (E1, E2);
• a distance (D2) between the first surface and the line is obtained;
• a visible light beam B1 is rotated from an initial direction (O′) substantially perpendicular with the first surface and the line to impinge on the point (E1);
• a first angle A1 defined by the visible light beam (B1) striking the point (E1) and the initial direction (O′) is computed;
• a visible light beam (B2) is rotated from pointing in an initial direction (O′) to impinge on the point (E2);
• a second angle (A2 defined by the visible light beam (B2) striking the point (E2) and the initial direction (O′) is computed;
• the distance (D1) between the two points is computed based on the distance (D2), the first angle A1 and the second angle (A2);
• and
• the distance (D1) is outputted to an output unit.