Method for checking and/or calibrating a vertical axis of a rotating laser with device axes (51, 52, 53), which are configured as a first horizontal axis, a second horizontal axis and a vertical axis, and with a laser receiver, in which the rotating laser emits a first laser beam rotatable around an axis of rotation and a stationary second laser beam running parallel to the axis of rotation and the laser receiver comprises a detection field with a longitudinal direction which 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 v) from the laser receiver, in which the rotating laser is aligned in a vertical position, in which the vertical axis runs perpendicular to the direction of gravity, and the laser receiver is aligned in a transverse arrangement, in which the transverse direction runs parallel to the direction of gravity, ▪ the device axes (51, 52, 53) of the rotating laser are aligned in a defined state, in which the defined state is established by a first zero position (υ 1) for the first horizontal axis, a second zero position (υ 2) for the second horizontal axis and a third zero position (υ 3) for the vertical axis, ▪ the rotating laser is arranged in a first angular position, in which the vertical axis is aligned with the detection field of the laser receiver in the first angular position, ▪ the incident position of the second 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 of the rotating laser, ▪ the incident position of the second 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 (D v) 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 v) from the laser receiver, in which the rotating laser is aligned in a vertical position, in which the vertical axis runs perpendicular to the direction of gravity, and the laser receiver is aligned in a transverse arrangement, in which the transverse direction runs parallel to the direction of gravity, ▪ the device axes (51, 52, 53) of the rotating laser are aligned in a defined state, in which the defined state is established by a first zero position (υ 1) for the first horizontal axis, a second zero position (υ 2) for the second horizontal axis and a third zero position (υ 3) for the vertical axis, ▪ the rotating laser is arranged in a first angular position, in which the vertical axis is aligned with the detection field of the laser receiver in the first angular position, ▪ the incident position of the second 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 of the rotating laser, ▪ the incident position of the second 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 (D v) between the rotating laser and the laser receiver is determined and ▪ the difference (Δ) is compared with a maximum difference (Δ max).