Height measuring apparatus and method thereof

A height measuring apparatus applicable for an environment with a first reflecting surface, the apparatus comprising:

• a baseboard having a top surface for carrying an object under test;
• at least one laser beam emitting module disposed in at least one emitting position on the top surface of the baseboard, wherein each laser beam emitting module is for emitting a first laser beam along a first light path and emitting a second laser beam along a second light path;
• at least one photo detection module disposed in at least one detecting position on the top surface of the baseboard, wherein each photo detection module is for selectively generating a first piece of data corresponding to a first reflecting light and a second piece of data corresponding to a second reflecting light by determining whether the first reflecting light resulting from the first laser beam reflected by the first reflecting surface and the second reflecting light resulting from the second laser beam reflected by both of the object under test and the first reflecting surface;
• and
• a control module electrically coupled to the laser beam emitting module and the photo detection module, wherein the control module is for calculating a first length according to the first piece of data, calculating a second length according to the second piece of data, and calculating a height of the object under test at least according to the first length and the second length.