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2. Flat Display Mounting Interface - Wikipedia

   en.wikipedia.org/wiki/Flat_Display_Mounting...

   Most sizes of VESA mount have four screw-holes arranged in a square on the mount, with matching tapped holes on the device. The horizontal and vertical distance between the screw centres respectively labelled as 'A', and 'B'. The original layout was a square of 100mm. A 75 mm × 75 mm (3.0 in × 3.0 in) was defined for smaller displays.

3. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

4. Snellen chart - Wikipedia

   en.wikipedia.org/wiki/Snellen_chart

   A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders .

5. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The size denotes the width of the faceplate for the installed equipment. The rack unit is a measure of vertical spacing and is common to both the 19 and 23-inch racks. Hole spacing is either on 1-inch (25 mm) centers (Western Electric standard), or the same as for 19-inch (482.6 mm) racks (0.625 in or 15.9 mm spacing).

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8. Storey pole - Wikipedia

   en.wikipedia.org/wiki/Storey_pole

   A storey pole (or story pole, storey rod, [1] story stick, [2] jury stick, [3] scantling, [4] scantillon [5]) is a length of narrow board usually cut to the height of one storey. [6] It is used as a layout tool for any kind of repeated work in carpentry including stair-building , framing , timber framing , siding , brickwork , and setting tiles.

9. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   The surveyor does this with the use of a bull's eye level built into the instrument mount. The surveyor looks through the eyepiece of the telescope while an assistant holds a vertical level staff which is graduated in inches or centimeters. The level staff is placed with its foot on the point for which the level measurement is required.