水準儀又稱平水鏡，主要用於土地之水平面度量。主要部分有望遠鏡、360度旋轉轉盤，望遠鏡上方有一球型水平尺，可調挍水平面。此儀器為日製一等水準儀。

This leveling instrument, also known as a “water level,” is primarily used for measuring the horizontal plane of land. Its main components include a telescope, a 360-degree rotating base, and a spherical leveling vial above the telescope to adjust the horizontal plane. This instrument is a first-class leveling instrument made in Japan.