Method for checking and/or calibrating a first or second horizontal axis (51, 52) of a rotating laser with a laser receiver, in which the rotating laser emits a laser beam rotatable around an axis of rotation and the laser receiver has a detection field with a longitudinal direction that corresponds to the measurement direction of the laser receiver and a transverse direction, with the steps: ▪ the rotating laser is positioned at a measuring distance (D H) from the laser receiver, in which the rotating laser is aligned in a horizontal position, in which the first and second horizontal axis (51, 52) are arranged perpendicular to the direction of gravity, and the laser receiver is aligned in a longitudinal arrangement, in which the longitudinal direction is arranged parallel to the direction of gravity, ▪ the first and second horizontal axis (51, 52) of the rotating laser are aligned in a horizontal state, in which the horizontal state of the horizontal axes (51, 52) is established by a first zero position (υ 1) for the first horizontal axis and a second zero position (υ 2) for the second horizontal axis, ▪ the rotating laser is arranged in a first angular position, in which the horizontal axis to be checked is aligned with the detection field of the laser receiver in the first angular position, ▪ the incident position of the laser beam on the detection field of the laser receiver is determined as a first control point and the distance of the first control point from a zero point of the detection field is stored as a first height offset (H 1), ▪ the rotating laser is arranged in a second angular position, in which the second angular position is turned 180° to the first angular position around the axis of rotation, ▪ the incident position of the laser beam on the detection field of the laser receiver is determined as a second control point and the distance of the second control point from the zero point of the detection field is stored as a second height offset (H 2), ▪ the distance between the first control point and the second control point is calculated as the difference (Δ = H 1 - H 2) between the first and second height offset (H 1, H 2), ▪ the measuring distance between the rotating laser and the laser receiver is determined and ▪ the difference (Δ) is compared with a maximum difference (Δ max). ▪ the rotating laser is positioned at a measuring distance (D H) from the laser receiver, in which the rotating laser is aligned in a horizontal position, in which the first and second horizontal axis (51, 52) are arranged perpendicular to the direction of gravity, and the laser receiver is aligned in a longitudinal arrangement, in which the longitudinal direction is arranged parallel to the direction of gravity, ▪ the first and second horizontal axis (51, 52) of the rotating laser are aligned in a horizontal state, in which the horizontal state of the horizontal axes (51, 52) is established by a first zero position (υ 1) for the first horizontal axis and a second zero position (υ 2) for the second horizontal axis, ▪ the rotating laser is arranged in a first angular position, in which the horizontal axis to be checked is aligned with the detection field of the laser receiver in the first angular position, ▪ the incident position of the laser beam on the detection field of the laser receiver is determined as a first control point and the distance of the first control point from a zero point of the detection field is stored as a first height offset (H 1), ▪ the rotating laser is arranged in a second angular position, in which the second angular position is turned 180° to the first angular position around the axis of rotation, ▪ the incident position of the laser beam on the detection field of the laser receiver is determined as a second control point and the distance of the second control point from the zero point of the detection field is stored as a second height offset (H 2), ▪ the distance between the first control point and the second control point is calculated as the difference (Δ = H 1 - H 2) between the first and second height offset (H 1, H 2), ▪ the measuring distance between the rotating laser and the laser receiver is determined and ▪ the difference (Δ) is compared with a maximum difference (Δ max).