A level includes a frame having a top planar surface, a bottom planar surface, and a web coupling the top planar surface to the bottom planar surface. The top planar surface and the bottom planar surface are parallel. The level further includes a vial supported by the frame. The vial has a longitudinal axis passing through a center of the vial and a body defining an interior containing a liquid and an indicator bubble. The level further includes a plurality of LEDs. Each of the LEDs has a light emitting point, and each of the plurality of LEDs is positioned adjacent an end of the vial and is oriented such that the light emitting point is positioned within the interior of the body of the vial.

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.

Embodiments provide a calibration tool for measuring a distance between a transducer and a liquid surface of an open channel, including: a pole; a flat board attached to the pole, configured to reflect a signal from the transducer, wherein the flat board is substantially perpendicular to the pole; a level device provided on the flat board, configured to ensure that the flat board is substantially parallel to a bottom of the open channel during a measurement; and a measuring scale provided on the pole.

Embodiments provide a calibration tool for measuring a distance between a transducer and a liquid surface of an open channel, including: a pole; a flat board attached to the pole, configured to reflect a signal from the transducer, wherein the flat board is substantially perpendicular to the pole; a level device provided on the flat board, configured to ensure that the flat board is substantially parallel to a bottom of the open channel during a measurement; and a measuring scale provided on the pole.

The present disclosure discloses a device (100) for determining orientation of an object. The device includes a hollow spherical member (101), which is filled with a fluid medium (109). A plurality of sensors (102) is positioned on a circumference of the hollow spherical member. Further, the device comprises a light source (104) fixed within the hollow spherical member, and a capsule (103) is disposed within the hollow spherical member. The capsule is configured to displace within the hollow spherical member and occupy uppermost point of the hollow spherical member. The capsule covers the one or more sensors at the corresponding uppermost point and, thus blocks impingement of light on to corresponding one or more sensors. The blocked one or more sensors activate or deactivate, and generate a feedback or input signal, which is received by a computing unit (107), to determine orientation of the object.

The present disclosure discloses a device (100) for determining orientation of an object. The device includes a hollow spherical member (101), which is filled with a fluid medium (109). A plurality of sensors (102) is positioned on a circumference of the hollow spherical member. Further, the device comprises a light source (104) fixed within the hollow spherical member, and a capsule (103) is disposed within the hollow spherical member. The capsule is configured to displace within the hollow spherical member and occupy uppermost point of the hollow spherical member. The capsule covers the one or more sensors at the corresponding uppermost point and, thus blocks impingement of light on to corresponding one or more sensors. The blocked one or more sensors activate or deactivate, and generate a feedback or input signal, which is received by a computing unit (107), to determine orientation of the object.

A level apparatus for chainsaws is provided. The level apparatus can be adhered to pre-existing chainsaws for indicating when a user is keeping the chainsaw level through a cut. The level apparatus may include a transparent vial defined by a curved portion and a planar portion engaging the curved portion at least along its periphery so that a fluid be may encased between the curved and planar portion. The fluid may accommodate a bubble so that when the vial is in a level state the bubble occupies the center of the curved portion, and wherein a non-level state the bubble slides along the curved portion accordingly, thereby indicating to the user that the level apparatus is not level.

A level apparatus for chainsaws is provided. The level apparatus can be adhered to pre-existing chainsaws for indicating when a user is keeping the chainsaw level through a cut. The level apparatus may include a transparent vial defined by a curved portion and a planar portion engaging the curved portion at least along its periphery so that a fluid be may encased between the curved and planar portion. The fluid may accommodate a bubble so that when the vial is in a level state the bubble occupies the center of the curved portion, and wherein a non-level state the bubble slides along the curved portion accordingly, thereby indicating to the user that the level apparatus is not level.

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.

A method of calibrating a levelling offset meter (LOM) for calculating the angular offset between a plane parallel to the LOM and a predetermined reference plane, the LOM comprises a bull's eye spirit level having a bubble and a processor coupled to an image, comprising: capturing, by the imager, a plurality of images of the spirit level associated with a respective plurality of known angular offsets; calculating in respect of each image a pixel distance from the bubble center to a predetermined zero offset pixel, thereby obtaining a plurality of pixel distances, each pixel distance associated with a known angular offset; fitting a function to a plurality of pairs of values, each pair of values comprising a pixel distance and its associated known angular offset; and storing the function in a memory.