| 摘要 |
A range finder is disclosed to include a housing, two spirit levels, a transceiver and a circuit board. The housing includes a first window defined therein, a second window defined therein and two fins formed thereon for contact with a first object. A phantom line, in which the centers of the windows lie, is perpendicular to a plane defined by the fins. The spirit levels are installed on the housing so that they are perpendicular to each other. The transceiver is installed in the housing. The transceiver can transmit laser to a second object through the first window. The transceiver can receive light reflected from the object. The circuit board is installed in the housing and electrically connected with the transceiver in order to receive data from the transceiver and determine the distance between the first and second objects based on the data.
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