A measuring apparatus includes a first angle measuring member, a second angle measuring member, and a display module. The first angle measuring member includes a first connecting shaft, a first needle rotatably connected to the first connecting shaft, and a first angle measuring instrument. The second angle measuring member includes a second connecting shaft, a second needle rotatably connected to the second connecting shaft, and a second angle measuring instrument. The first angle measuring instrument is configured to measure a first angle between the first needle and the first connecting shaft, and the second angle measuring instrument is configured to measure a second angle between the second needle and the second connecting shaft. The display module is configured to calculate a size of the object based on the first angle, the second angle, and lengths of the first connecting shaft and the second connecting shaft.

A measuring apparatus includes a first angle measuring member, a second angle measuring member, and a display module. The first angle measuring member includes a first connecting shaft, a first needle rotatably connected to the first connecting shaft, and a first angle measuring instrument. The second angle measuring member includes a second connecting shaft, a second needle rotatably connected to the second connecting shaft, and a second angle measuring instrument. The first angle measuring instrument is configured to measure a first angle between the first needle and the first connecting shaft, and the second angle measuring instrument is configured to measure a second angle between the second needle and the second connecting shaft. The display module is configured to calculate a size of the object based on the first angle, the second angle, and lengths of the first connecting shaft and the second connecting shaft.

A circle compass is provided. The circle compass includes a main body attachable to a router and an adjustable arm. The main body includes a central receiving aperture configured to receive a router bit or shaft therethrough. The adjustable arm is slidably attached to the main body and has a centering pin. The centering pin extends axially outward beyond a bottom side of the main body. The adjustable arm is slidable along an adjustment axis between a retracted position being associated with a smallest hole that can be formed and an extended position being associated with the largest hole that can be formed. The adjustable arm includes a clearance slot that at least partially aligns with the central receiving aperture of the main body through which the rotating portion of the router must extend to form a cut in the work piece.

The present disclosure provides a sliding adjustable compass having a support for holding a variety of marking and cutting implements which can be easily replaced when they are used up. The construction of the compass is such that large diameter circles can be marked or cut precisely with the help of a viewing lens, whilst maintaining portability by a modular design.

Generally, a device to measure the circumference of circular objects. Specifically, a device including a pair of slidingly engaged members disposed between a pair of arms configured to be engaged with tread on a tire at about the midline of a wheel, an electrical circuit which varies in output voltage based on the distance between the pair of arms, and a processor communicatively coupled to a non-transitory computer readable medium containing a program which correlates the output voltage of the electrical circuit to a unit measure of distance between the pair of arms and calculates tire circumference.

Generally, a device to measure the circumference of circular objects. Specifically, a device including a pair of slidingly engaged members disposed between a pair of arms configured to be engaged with tread on a tire at about the midline of a wheel, an electrical circuit which varies in output voltage based on the distance between the pair of arms, and a processor communicatively coupled to a non-transitory computer readable medium containing a program which correlates the output voltage of the electrical circuit to a unit measure of distance between the pair of arms and calculates tire circumference.

Generally, a device to measure the circumference of circular objects. Specifically, a device including a pair of slidingly engaged members disposed between a pair of arms configured to be engaged with tread on a tire at about the midline of a wheel, an electrical circuit which varies in output voltage based on the distance between the pair of arms, and a processor communicatively coupled to a non-transitory computer readable medium containing a program which correlates the output voltage of the electrical circuit to a unit measure of distance between the pair of arms and calculates tire circumference.

Generally, a device to measure the circumference of circular objects. Specifically, a device including a pair of slidingly engaged members disposed between a pair of arms configured to be engaged with tread on a tire at about the midline of a wheel, an electrical circuit which varies in output voltage based on the distance between the pair of arms, and a processor communicatively coupled to a non-transitory computer readable medium containing a program which correlates the output voltage of the electrical circuit to a unit measure of distance between the pair of arms and calculates tire circumference.

Generally, a device to measure the circumference of circular objects. Specifically, a device including a pair of slidingly engaged members disposed between a pair of arms configured to be engaged with tread on a tire at about the midline of a wheel, an electrical circuit which varies in output voltage based on the distance between the pair of arms, and a processor communicatively coupled to a non-transitory computer readable medium containing a program which correlates the output voltage of the electrical circuit to a unit measure of distance between the pair of arms and calculates tire circumference.

Generally, a device to measure the circumference of circular objects. Specifically, a device including a pair of slidingly engaged members disposed between a pair of arms configured to be engaged with tread on a tire at about the midline of a wheel, an electrical circuit which varies in output voltage based on the distance between the pair of arms, and a processor communicatively coupled to a non-transitory computer readable medium containing a program which correlates the output voltage of the electrical circuit to a unit measure of distance between the pair of arms and calculates tire circumference.