Method for checking a rotating laser for cone error with a laser receiver, wherein the rotating laser emits a laser beam rotatable in a horizontal plane around an axis of rotation, and the horizontal plane is spanned by a first and second horizontal axis (51, 52) and the laser receiver comprises a detection field with a longitudinal direction which corresponds to the measurement direction and a transverse direction, with the steps: ▪ the rotating laser is set up in a first location position between a first measuring surface and a second measuring surface, wherein the rotating laser in the first location position has a first measuring distance (D 1) to the second measuring surface and is aligned in a measuring direction onto the second measuring surface, ▪ the horizontal axes (51, 52) of the rotating laser are set up in a horizontal state, wherein the horizontal state of the horizontal axes (51, 52) is determined 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 incident position of the laser beam on the first measuring surface is defined as a first control point, ▪ the incident position of the laser beam on the second measuring surface is defined by the detection field of the laser receiver as a second control point, and the distance from the second control point to a zero point of the detection field is stored as a first height offset (H 1), ▪ the rotating laser is set up in a second location position between the first measuring surface and the second measuring surface, wherein the rotating laser in the second location position has a second measuring distance (D 2) to the second measuring surface and is aligned in the measuring direction onto the second measuring surface, ▪ the rotating laser is arranged in the second location position at a height at which the incident position of the laser beam on the first measuring surface coincides with the first control point, ▪ the incident position of the laser beam on the second measuring surface is defined by the detection field of the laser receiver as a third control point, and the distance from the third control point to the zero point of the detection field is stored as a second height offset (H 2), ▪ the distance between the second control point and the third control point is calculated as the difference (Δ) from the first and second height offsets (H 1, H 2), ▪ a cone error (δ) is calculated from the first measuring distance (D 1), the second measuring distance (D 2), and the difference (Δ), and ▪ the cone error (δ) is compared with a maximum error (δ max). ▪ the rotating laser is set up in a first location position between a first measuring surface and a second measuring surface, wherein the rotating laser in the first location position has a first measuring distance (D 1) to the second measuring surface and is aligned in a measuring direction onto the second measuring surface, ▪ the horizontal axes (51, 52) of the rotating laser are set up in a horizontal state, wherein the horizontal state of the horizontal axes (51, 52) is determined 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 incident position of the laser beam on the first measuring surface is defined as a first control point, ▪ the incident position of the laser beam on the second measuring surface is defined by the detection field of the laser receiver as a second control point, and the distance from the second control point to a zero point of the detection field is stored as a first height offset (H 1), ▪ the rotating laser is set up in a second location position between the first measuring surface and the second measuring surface, wherein the rotating laser in the second location position has a second measuring distance (D 2) to the second measuring surface and is aligned in the measuring direction onto the second measuring surface, ▪ the rotating laser is arranged in the second location position at a height at which the incident position of the laser beam on the first measuring surface coincides with the first control point, ▪ the incident position of the laser beam on the second measuring surface is defined by the detection field of the laser receiver as a third control point, and the distance from the third control point to the zero point of the detection field is stored as a second height offset (H 2), ▪ the distance between the second control point and the third control point is calculated as the difference (Δ) from the first and second height offsets (H 1, H 2), ▪ a cone error (δ) is calculated from the first measuring distance (D 1), the second measuring distance (D 2), and the difference (Δ), and ▪ the cone error (δ) is compared with a maximum error (δ max).