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What are the parts of a digital angle gauge
(digital protractor)?

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A digital protractor: (Bottom) On/Off button, "Hold" button, "Zero" button; (Top) LCD (Liquid Crystal Display)

On and off button

The on/off button; digital protractor, digital angle gauge This button allows you to turn the digital protractor on or off (providing that a battery is installed, of course).

LCD (Liquid Crystal Display)

The LCD (Liquid Crystal Display); digital protractor, digital angle gauge This is the digital display where measurements (and some different modes) will be shown.

Hold button

The "hold" button; digital protractor, digital angle gauge Holding down this button and keeping the protractor still allows you to stop the reading from changing further, until you press the button a second time.

Zero button

The "zero" button; digital protractor, digital angle gauge Pressing in this button allows you to change the mode which the digital protractor is currently set to, changing it from “horizontal measurement mode” to “relative measurement mode”.
A digital angle gauge with two buttons; "on/off" and "zero"; liquid crystal display, magnets The user must be aware, however, that the different devices may well have different buttons and modes. It is best to refer to your product’s individual instructions for detailed instructions.
A digital angle gauge with magnets being used to position a saw Some devices are fitted with magnets to allow them to stick to surfaces.

This may be useful for applications such as using an angle gauge to set the angle of a table saw.

Horizontal measurement mode

A digital protractor on a flat horizontal surface “Horizontal measurement mode” measures the angle from a horizontal surface.

Relative measurement mode

The relative measurement mode during use; digital protractor, digital angle gauge “Relative measurement mode” allows the user to use any surface (of any angle) as the point from which measurements are taken.