A digital slope meter includes: a shaft extended in a longitudinal direction thereof and having a rolling groove formed on top thereof in the longitudinal direction thereof to allow a golf ball placed thereon to be moved down therealong, when the rear side thereof is tilted up in a state where the front side there is located on a green, and to then roll on the green from a discharging end formed at the front end thereof; and a measuring module located on the shaft to measure a moving distance and an isolated angle of the golf ball rolling on the green from the discharging end when the rear side of the shaft is tilted up.

A level including level vial(s) having enhanced visibility are provided. The level may include a level vial including a material that is attracted to the interface or border of a globule within the level vial which improves visibility of the interface. The level may include a solid level indicator having easy to see end surfaces that are generally vertically oriented when in the level position. The end surfaces of the solid level indicator may allow the user to more easily compare the position of the solid level indicator to indicating lines formed on the level vial. The level may include a level vial including a first liquid and an immiscible second liquid forming a globule with the first material. The globule formed from the second material may improve visibility compared to a typical air bubble.

A level including level vial(s) having enhanced visibility are provided. The level may include a level vial including a material that is attracted to the interface or border of a globule within the level vial which improves visibility of the interface. The level may include a solid level indicator having easy to see end surfaces that are generally vertically oriented when in the level position. The end surfaces of the solid level indicator may allow the user to more easily compare the position of the solid level indicator to indicating lines formed on the level vial. The level may include a level vial including a first liquid and an immiscible second liquid forming a globule with the first material. The globule formed from the second material may improve visibility compared to a typical air bubble.

A low cost position sensor and a mobility device using the same are provided. The low cost position sensor comprises a rollable object, a container and a control circuit. The rollable object comprises a specific material. The container has a non-planar inner bottom portion. At least one sensor for detecting coordinates is disposed inside the container. The rollable object is disposed in the container. The sensor can detect the specific material. The control circuit is coupled to the sensor. The sensor detects the specific material to determine a coordinate position of the rollable object, and sends the coordinate position of the rollable object back to the control circuit. The control circuit determines a tilt angle of the container according to the coordinate position of the rollable object.

A low cost position sensor and a mobility device using the same are provided. The low cost position sensor comprises a rollable object, a container and a control circuit. The rollable object comprises a specific material. The container has a non-planar inner bottom portion. At least one sensor for detecting coordinates is disposed inside the container. The rollable object is disposed in the container. The sensor can detect the specific material. The control circuit is coupled to the sensor. The sensor detects the specific material to determine a coordinate position of the rollable object, and sends the coordinate position of the rollable object back to the control circuit. The control circuit determines a tilt angle of the container according to the coordinate position of the rollable object.

The Mini 3D orientation sensor device has convex spherical body structure in a mechanical sensor coupled to logic to manage the reverse touchscreen component, alarm and other functions for the sensor. The spherical housing sensor is comprises a plurality of layers analogous to a touchscreen complete with conducting probes, an unconstrained surface compressing ball dynamic inside the spherical grid position structure that closes a electric circuit upon depressing the inside surface of the sphere housing. The sphere depressed coordinates are mapped to its 3D orientation upon output.

A level gauge includes a housing, a vertical member, and a perpendicular member. The housing includes a bottom wall and a side wall. A surface of the side wall includes a first scale. The bottom wall and the side wall enclose a receiving cavity. The vertical member is arranged in the receiving cavity and includes an axis maintained in a vertical orientation in a natural state. A center of gravity of the perpendicular member is arranged on top of the vertical member. A plane of the perpendicular member is maintained perpendicular to the axis of the vertical member. When the bottom wall is placed on a gauging surface, an inclination angle and inclination direction of the gauging surface are obtained simultaneously.

Disclosed is a double-bead horizontal and vertical spirit level having a transparent tube contains an air bubble, a basic liquid and bead insoluble in the basic liquid and having a density greater than that of the basic liquid. By comparing the relative positions of the air bubble and bead, the spirit level gives precise measurements. An apparatus using the spirit level and protractor can measure horizontal tilt angles of upper and lower surfaces, and vertical tilt angle of the vertical plane; it can also be further combined with a laser pen to measure the angle of elevation, distance, height of a remote object, tilt angles, draw a horizontal and plumb line. An apparatus where the long axis of spirit level is perpendicular to the axis of pivot, the long axis doesn't need to pass the axis of pivot and the space could be used to install a laser pen.

Disclosed is a double-bead horizontal and vertical spirit level having a transparent tube contains an air bubble, a basic liquid and bead insoluble in the basic liquid and having a density greater than that of the basic liquid. By comparing the relative positions of the air bubble and bead, the spirit level gives precise measurements. An apparatus using the spirit level and protractor can measure horizontal tilt angles of upper and lower surfaces, and vertical tilt angle of the vertical plane; it can also be further combined with a laser pen to measure the angle of elevation, distance, height of a remote object, tilt angles, draw a horizontal and plumb line. An apparatus where the long axis of spirit level is perpendicular to the axis of pivot, the long axis doesn't need to pass the axis of pivot and the space could be used to install a laser pen.

A tilt switch based on differential threshold sensing includes a tilt track (such as a tilt tube), and a tilt/target element moveable along the tilt track by gravity between first/second ends based on tilt angle. An inductive sensor includes first/second sense coils at the ends of the tilt track, and sensor circuitry (a) to drive each sense coil to project a magnetic sensing field, and to measure a differential sensor to a position of the tilt/target element relative to the sense coils, based on a property corresponding to sense coil inductance (for example, relative to a pre-defined switching threshold position), and (b) to provide, in response to the differential sensor response, a tilt switch output corresponding to a tilt angle of the tilt track based on a position of the tilt/target element relative to the sense coils (or switching threshold), for example, with a pre-defined hysteresis.