A speed square is provided including a triangular flat plate having measurement markings indicated on at least one face, a T bar affixed to, and extending along, the length of a first side of the triangular flat plate, and an extension element hingedly connected to an end of second side of the triangular flat plate opposite the T bar. The extension element having measurement markings indicated on at least one face, such that the measurement markings of the triangular flat face continue on the extension element.

A handrail installation device, including a first arm removably connected to at least a portion of a stair tread, a second arm pivotally disposed at a first end on at least a portion of the first arm to rotate from retracted in parallel with the first arm in a first position to at least partially extended away from the first arm in a second position, and rotate from extended away from the first arm in the second position to retracted in parallel with the first arm in the first position, and a bubble level disposed on at least a portion of the second arm to identify a level surface based on a position of at least one of the first arm and the second arm.

A case includes a first housing portion, a second housing portion, a first auxiliary structure, and a second auxiliary structure. The second housing portion is movably coupled to the first housing portion and cooperates with the first housing portion to define a storage space. The first auxiliary structure is disposed on one of the first housing portion and the second housing portion. The second auxiliary structure is disposed on one of the first housing portion and the second housing portion. The first auxiliary structure is a foot disposed on and extending from an exterior surface of the first housing portion. The foot is configured to abut a workpiece to orient the workpiece in at least one preset angle relative to the first housing portion. The second auxiliary structure is a recess.

A stepwise adjustable square for use in carpentry, including: a stock; and a blade rotatable relative to the stock around an axis of rotation between a first extreme position at zero degrees, where the blade is parallel to the stock and partly provided in a space of the stock, and a second extreme position at about 270 degrees, where the blade is substantially perpendicular to the stock.

A stepwise adjustable square for use in carpentry, including: a stock; and a blade rotatable relative to the stock around an axis of rotation between a first extreme position at zero degrees, where the blade is parallel to the stock and partly provided in a space of the stock, and a second extreme position at about 270 degrees, where the blade is substantially perpendicular to the stock.

A metrology device with automated compensation and/or alert for orientation errors. The device may include a processor, a probe portion and at least one orientation sensor. The probe provides an output representative of a raw measurement of a characteristic of a device under test and the orientation sensor provides a sensor output representative of an orientation of the metrology device to the device under test. The processor applies a correction factor to the raw measurement in response to the sensor output to establish a compensated measurement to compensate for misalignment of the metrology device to the device under test. In addition, or alternatively, the processor provides an alert indicating the existence and/or extent of the misalignment.

The hammer has a head and a handle which extends from the head. The head has at least two surfaces that face towards the handle and that lie in a common first plane. At least a portion of the handle extends linearly and perpendicularly from the first plane to allow a user to draw a straight line which is perpendicular to the first plane.

The hammer has a head and a handle which extends from the head. The head has at least two surfaces that face towards the handle and that lie in a common first plane. At least a portion of the handle extends linearly and perpendicularly from the first plane to allow a user to draw a straight line which is perpendicular to the first plane.

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.