An electronic marker for locating obscured objects such as buried conduits has a built-in level indicator to provide a visual indication of when the marker has been properly oriented, e.g., a flat marker which should be positioned horizontally when deployed. The level indicator can be an air-bubble level formed from a transparent semispherical portion of the marker body with a partially-filled chamber. Alternatively, the level indicator can be a gravity-ball level with a circular ridge formed along the concave interior surface of the semispherical portion and a ball located within the ridge. In a further embodiment the level indicator is an electronic level having a tilt indicator circuit in which an electronic controller selectively illuminates light sources in response to signals from tilt sensors. The light sources may for example comprise four light-emitting diodes located at four respective corners of the marker body.

An electronic marker for locating obscured objects such as buried conduits has a built-in level indicator to provide a visual indication of when the marker has been properly oriented, e.g., a flat marker which should be positioned horizontally when deployed. The level indicator can be an air-bubble level formed from a transparent semispherical portion of the marker body with a partially-filled chamber. Alternatively, the level indicator can be a gravity-ball level with a circular ridge formed along the concave interior surface of the semispherical portion and a ball located within the ridge. In a further embodiment the level indicator is an electronic level having a tilt indicator circuit in which an electronic controller selectively illuminates light sources in response to signals from tilt sensors. The light sources may for example comprise four light-emitting diodes located at four respective corners of the marker body.

An installation guide for installing a screw at a predetermined angle relative to a reference plane is disclosed. The installation guide includes a housing configured for releasable connection to a bit. The housing includes a channel being sized and shaped to receive the bit therein for retaining the housing on the bit. The channel allows the bit to rotate relative to the housing. An indicator is supported by the housing and is configured for movement relative to the housing to indicate an angle of the housing relative to a reference plane.

An installation guide for installing a screw at a predetermined angle relative to a reference plane is disclosed. The installation guide includes a housing configured for releasable connection to a bit. The housing includes a channel being sized and shaped to receive the bit therein for retaining the housing on the bit. The channel allows the bit to rotate relative to the housing. An indicator is supported by the housing and is configured for movement relative to the housing to indicate an angle of the housing relative to a reference plane.

The underground inclinometer system includes a probe having a displacement measurement sensor measuring displacement of the ground, a cable controller controlling the length of a cable inserted into the ground to move the probe within an inclinometer pipe, and a ground displacement calculator calculating the displacement of the ground by using displacement measurement information measured by the probe and information on the length of the cable controlled by the cable controller.

The underground inclinometer system includes a probe having a displacement measurement sensor measuring displacement of the ground, a cable controller controlling the length of a cable inserted into the ground to move the probe within an inclinometer pipe, and a ground displacement calculator calculating the displacement of the ground by using displacement measurement information measured by the probe and information on the length of the cable controlled by the cable controller.

A method and apparatus for testing roll together of a mattress using two weights, preferably weighted cylinders, and moving one of the weights towards the other while measuring change in distance between the weights and changes in angle of the stationary weight.

A method and apparatus for testing roll together of a mattress using two weights, preferably weighted cylinders, and moving one of the weights towards the other while measuring change in distance between the weights and changes in angle of the stationary weight.

The present disclosure relates to a device (100) for determining orientation of an object (3). The device (100) includes a hollow-spherical enclosure (2) supportable by the object (3) and a plurality of sensors (S1 . . . Sn) circumferentially disposed in the hollow-spherical enclosure (2). A gimbal assembly (1) is secured in the hollow-spherical enclosure (2), where at least one gimbal ring of the gimbal assembly (1) is fixed perpendicular to a gravitational weight a gravitational vector (G) of the gimbal assembly (1). Further, at least one light source (8) is secured in the gimbal assembly (1) and the gimbal assembly (1) is configured to align the at least one light source (8) relative to orientation of the object (3) such that, the light emitted by the at least one light source (8) is incident on at least one sensor of the plurality of sensors (S1 . . . Sn), to determine orientation of the object (3).

The present disclosure relates to a device (100) for determining orientation of an object (3). The device (100) includes a hollow-spherical enclosure (2) supportable by the object (3) and a plurality of sensors (S1 . . . Sn) circumferentially disposed in the hollow-spherical enclosure (2). A gimbal assembly (1) is secured in the hollow-spherical enclosure (2), where at least one gimbal ring of the gimbal assembly (1) is fixed perpendicular to a gravitational weight a gravitational vector (G) of the gimbal assembly (1). Further, at least one light source (8) is secured in the gimbal assembly (1) and the gimbal assembly (1) is configured to align the at least one light source (8) relative to orientation of the object (3) such that, the light emitted by the at least one light source (8) is incident on at least one sensor of the plurality of sensors (S1 . . . Sn), to determine orientation of the object (3).