A level holding device configured to have releasably secured thereto a first laser level and a second laser level wherein the present invention secures the first laser level and second laser level such that lasers emitting therefrom intersect at a ninety degree orientation. The present invention includes a base support member wherein the base support member includes a first portion and a second portion. The first portion and second portion of the base support member are contiguously formed. The first portion and second portion have secured thereto retention clamps that are configured to releasably secure a laser level to the upper surface thereof. The base support member is elevated above the floor on which the level holding device is superposed utilizing a plurality of leg members. The leg members are further configured to be superposed an element protruding upward from the floor.

A level holding device configured to have releasably secured thereto a first laser level and a second laser level wherein the present invention secures the first laser level and second laser level such that lasers emitting therefrom intersect at a ninety degree orientation. The present invention includes a base support member wherein the base support member includes a first portion and a second portion. The first portion and second portion of the base support member are contiguously formed. The first portion and second portion have secured thereto retention clamps that are configured to releasably secure a laser level to the upper surface thereof. The base support member is elevated above the floor on which the level holding device is superposed utilizing a plurality of leg members. The leg members are further configured to be superposed an element protruding upward from the floor.

A footer square apparatus may be used to measuring a building foundation and may include a footer square body, a first guide line, a second guide line, a third guide line, a corner marking, and at least one angle marking. The first guide line and second guide line may be perpendicular, and the third guide line may form a 45 angle with the first guide line and second guide line. The at least one angle marking may identify an angle as measured between a line from the corner marking to the angle marking and at least one of the first guide line, the second guide line, and the third guide line.

A footer square apparatus may be used to measuring a building foundation and may include a footer square body, a first guide line, a second guide line, a third guide line, a corner marking, and at least one angle marking. The first guide line and second guide line may be perpendicular, and the third guide line may form a 45 angle with the first guide line and second guide line. The at least one angle marking may identify an angle as measured between a line from the corner marking to the angle marking and at least one of the first guide line, the second guide line, and the third guide line.

A hydraulic excavator is equipped with a bucket, a tilt cylinder, a fourth stroke sensor, and a bucket information computing unit. The bucket is able to rotate about the center of a tilt axis. The tilt cylinder causes the bucket to rotate about the center of the tilt axis. The fourth stroke sensor detects a stroke length of the tilt cylinder. The bucket information computing unit obtains a tilt angle of the bucket on the basis of the stroke length detected by the fourth stroke sensor.

A hydraulic excavator is equipped with a bucket, a tilt cylinder, a fourth stroke sensor, and a bucket information computing unit. The bucket is able to rotate about the center of a tilt axis. The tilt cylinder causes the bucket to rotate about the center of the tilt axis. The fourth stroke sensor detects a stroke length of the tilt cylinder. The bucket information computing unit obtains a tilt angle of the bucket on the basis of the stroke length detected by the fourth stroke sensor.

A hydraulic excavator is equipped with a bucket, a tilt cylinder, a fourth stroke sensor, and a bucket information computing unit. The bucket is able to rotate about the center of a tilt axis. The tilt cylinder causes the bucket to rotate about the center of the tilt axis. The fourth stroke sensor detects a stroke length of the tilt cylinder. The bucket information computing unit obtains a tilt angle of the bucket on the basis of the stroke length detected by the fourth stroke sensor.

A hydraulic excavator is equipped with a bucket, a tilt cylinder, a fourth stroke sensor, and a bucket information computing unit. The bucket is able to rotate about the center of a tilt axis. The tilt cylinder causes the bucket to rotate about the center of the tilt axis. The fourth stroke sensor detects a stroke length of the tilt cylinder. The bucket information computing unit obtains a tilt angle of the bucket on the basis of the stroke length detected by the fourth stroke sensor.

A method for comparing a received beam incident on a laser receiver in a longitudinal arrangement with a rotating laser beam which is moved by a rotating laser in a horizontal position about an axis of rotation, where the laser receiver includes an evaluation unit and a detection field having a longitudinal direction and a transverse direction, includes disposing the rotating laser on a tripod adjustable along an axis and the horizontal laser plane that the rotating laser beam produces is moved by the tripod in a height direction along the axis. In the longitudinal direction of the detection field, the evaluation unit determines an adjustment direction of the received beam relative to the laser receiver, and the evaluation unit compares the adjustment direction of the received beam with the height direction of the tripod.

A method for comparing a received beam incident on a laser receiver in a longitudinal arrangement with a rotating laser beam which is moved by a rotating laser in a horizontal position about an axis of rotation, where the laser receiver includes an evaluation unit and a detection field having a longitudinal direction and a transverse direction, includes disposing the rotating laser on a tripod adjustable along an axis and the horizontal laser plane that the rotating laser beam produces is moved by the tripod in a height direction along the axis. In the longitudinal direction of the detection field, the evaluation unit determines an adjustment direction of the received beam relative to the laser receiver, and the evaluation unit compares the adjustment direction of the received beam with the height direction of the tripod.