A vehicle safety device for detecting vehicle tilt automatically shuts-off power to an ignition system and fuel pump and summons emergency assistance using a bistable switch circuit that toggles between a first bistable switch position in response to a reset signal and a second bistable switch position in response to an alert signal. The safety device can remain in the bistable switch positions without a power source and employ an encrypted bi-directional protocol to summon emergency assistance and generate the reset signal without vehicle operator intervention.

Disclosed is a multifunctional level gauge for applying a nano adhesive tape for convenient and quick positioning. The multifunctional level gauge comprises a level ruler (1) with a hollow profile, wherein a transverse level (2) and a vertical level (3) are respectively arranged on the level ruler (1), at least two nano adhesive tapes (4) for convenient and quick positioning are pasted and fixed to a left side surface of the level ruler (1), and an adhesive tape positioning structure is arranged below the nano adhesive tapes (4); and an angle measurement device (5) capable of performing 360-degree omnidirectional measurement and a swing-type offset measurement structure for cooperatively observing whether an intersection plane is inclined are arranged at an upper end portion of the level ruler (1), and the swing-type offset measurement structure comprises a swing connection rod (6), a counterweight cone (7) and an alignment pointer (8). On the basis of achieving 360-degree omnidirectional angle measurement, horizontal measurement, vertical measurement, and plane measurement can be achieved at the same time; during measurement, whether a measurement plane is inclined can be determined by observing whether the counterweight cone (7) coincides with the alignment pointer (8); and the multifunctional level gauge can be directly pasted to the measurement plane, the level gauge can be conveniently placed by a worker, the working efficiency is improved, and the measuring effect is good.

An automatic process and structural features for accurately producing levels is provided. The process enables more rapid production of levels, less operator work or error, and the ability to quantify errors and tolerances in the manufacture of the level. Coupling a level datum plane formed on the endcaps of a vial with a level datum plane of a frame ensures accurate construction of a level that can be automated and toleranced. Ensuring that the level datum plane created at the endcaps remains parallel (or at some other predesigned angle) to the measuring surfaces of the level reduces labor to manufacture the level and ensures measurement accuracy.

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.

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.

A spirit level includes a housing having an elongated body and a level tube set and a lighting device mounted in the body of the housing. The body has a recessed accommodation chamber and two positioning grooves connected to the recessed accommodation chamber and disposed adjacent to the end portions of the level tubes of the level tube set. The lighting device includes a controller mounted in the recessed accommodation chamber and a plurality of light-emitting devices respectively mounted in the positioning grooves for illuminating the level tubes so that the user can see the level tubes. The invention simplifies the assembly of the spirit level and makes it easy to repair or replace the light-emitting devices of the lighting device without increasing the height or thickness of the spirit level.

A spirit level includes a housing having an elongated body and a level tube set and a lighting device mounted in the body of the housing. The body has a recessed accommodation chamber and two positioning grooves connected to the recessed accommodation chamber and disposed adjacent to the end portions of the level tubes of the level tube set. The lighting device includes a controller mounted in the recessed accommodation chamber and a plurality of light-emitting devices respectively mounted in the positioning grooves for illuminating the level tubes so that the user can see the level tubes. The invention simplifies the assembly of the spirit level and makes it easy to repair or replace the light-emitting devices of the lighting device without increasing the height or thickness of the spirit level.

An arca-type camera mounting plate includes a back side with leveling displays for unobstructed viewing of the leveling displays when the camera is mounted. The leveling displays may include vertical and horizontal bubble levels.

An arca-type camera mounting plate includes a back side with leveling displays for unobstructed viewing of the leveling displays when the camera is mounted. The leveling displays may include vertical and horizontal bubble levels.

A spirit level includes a housing having an elongated body and a level tube set and a lighting device mounted in the body of the housing. The body has a recessed accommodation chamber and two positioning grooves connected to the recessed accommodation chamber and disposed adjacent to the end portions of the level tubes of the level tube set. The lighting device includes a controller mounted in the recessed accommodation chamber and a plurality of light-emitting devices respectively mounted in the positioning grooves for illuminating the level tubes so that the user can see the level tubes. The invention simplifies the assembly of the spirit level and makes it easy to repair or replace the light-emitting devices of the lighting device without increasing the height or thickness of the spirit level.