A method for measuring a tool, a method for mounting a tool in a tool holder, a screen, a computing unit with such a screen and a presetting device and/or shrinking device with such a screen, and uses of a screen for measuring a tool. A method for measuring a tool using a screen by providing a display screen; and measuring the tool by way of the display screen. A tool measuring device having a display screen configured for measuring a tool. The display screen can have a measuring scale wherein the tool is measured by the measuring scale.

Provided is a measuring device which, with respect to a measuring instrument for measuring the length of a cutting tool, measures the distance from a reference position of a machine tool to a tool detection position of the measuring instrument. The measuring device comprises: a movement control unit for controlling movement of a standard tool attached to the machine tool; a detection unit for detecting a detection signal indicating a tool detection position output by pressing-down of the measuring instrument; and an identification unit for identifying the tool detection position of the measuring instrument, on the basis of the position of the tip of the standard tool at the timing of detecting the detection signal. The detection unit detects the detection signal indicating that the tip of the standard tool is present within a tool detectable range including the tool detection position. The movement control unit moves the standard tool in a direction away from the measuring instrument to change the state in which the detection signal is detectable by the detection unit to a state in which the detection signal is not detectable by the detection unit, and then moves the standard tool toward the measuring instrument to change the state to a state in which the detection signal is detectable again by the detection unit. The identification unit identifies the tool detection position, on the basis of the position of the standard tool at the timing of detecting the detection signal again.