Abstract: A device 1 mountable to an upright ST. The device comprises a body 3 and an arm 5. The body is reversible relative to the upright, about an upright axis, from a first orientation to a second orientation. The body comprises first contacting portions 3a (arranged to contact a front of the upright when the body is in the first orientation) and second contacting portions 3b (arranged to contact a front of the upright when the body is in the second orientation). The arm is movable relative to the body from a first position (in which the arm extends rearwardly beyond the first contacting portions to pass one side of the upright and engage a rear of the upright) to a second position (in which the arm extends rearwardly beyond the second contacting portions to pass another side of the upright and engage the rear of the upright).

Abstract: A device 1 mountable to an upright ST. The device comprises a body 3 and an arm 5. The body is reversible relative to the upright, about an upright axis, from a first orientation to a second orientation. The body comprises first contacting portions 3a (arranged to contact a front of the upright when the body is in the first orientation) and second contacting portions 3b (arranged to contact a front of the upright when the body is in the second orientation). The arm is movable relative to the body from a first position (in which the arm extends rearwardly beyond the first contacting portions to pass one side of the upright and engage a rear of the upright) to a second position (in which the arm extends rearwardly beyond the second contacting portions to pass another side of the upright and engage the rear of the upright).

Abstract: A laser receiving arrangement, co-operable with a reference plane defined by a laser transmitter, including a data storage device, a sensing arrangement, a logic arrangement and a user interface. The data storage device stores a respective desired elevation for each of a plurality of target points. The sensing arrangement senses the reference plane and produces an output indicative of an elevation of a selected target point relative to the reference plane. The logic arrangement is configured to receive from the data storage device the respective desired elevation of the selected target point, receive the output of the sensing arrangement, and produce an output based on at least the received elevation and the received output. The user interface is configured to produce an output interpretable by a user, based on the output of the logic arrangement and indicative of a deviation of the target point from its respective desired elevation.

Abstract: A laser receiving arrangement, co-operable with a reference plane defined by a laser transmitter, including a data storage device, a sensing arrangement, a logic arrangement and a user interface. The data storage device stores a respective desired elevation for each of a plurality of target points. The sensing arrangement senses the reference plane and produces an output indicative of an elevation of a selected target point relative to the reference plane. The logic arrangement is configured to receive from the data storage device the respective desired elevation of the selected target point, receive the output of the sensing arrangement, and produce an output based on at least the received elevation and the received output. The user interface is configured to produce an output interpretable by a user, based on the output of the logic arrangement and indicative of a deviation of the target point from its respective desired elevation.