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2. Tape measure - Wikipedia

   en.wikipedia.org/wiki/Tape_measure

   A tape measure or measuring tape is a long, flexible ruler used to measure length or distance. [1] It usually consists of a ribbon of cloth, plastic, fibreglass, or metal strip with linear measurement markings.

3. Diameter tape - Wikipedia

   en.wikipedia.org/wiki/Diameter_tape

   To measure the diameter of a tree, the diameter tape (diameter side facing user) is wrapped around the tree, in the plane perpendicular to the axis of the trunk at 4.5 feet (1.4 m) above ground (or 4.27 feet (1.30 m), depending on the location) . Where the number "0" aligns with the rest of the tape, the diameter can be read directly from the ...

4. Ruler - Wikipedia

   en.wikipedia.org/wiki/Ruler

   A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]

5. Metric system - Wikipedia

   en.wikipedia.org/wiki/Metric_system

   A kilogram mass and three metric measuring devices: a tape measure in centimetres, a thermometer in degrees Celsius, and a multimeter that measures potential in volts, current in amperes and resistance in ohms.

6. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   22 cm = 2.2 dm – diameter of a typical association football (soccer ball) 30 cm = 3 dm – typical school-use ruler length (= 300 mm) 30.48 cm = 3.048 dm – 1 foot (measure) 60 cm = 6 dm – standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm) 90 cm = 9 dm – average length of a rapier, a fencing sword [30]

7. Diameter at breast height - Wikipedia

   en.wikipedia.org/wiki/Diameter_at_breast_height

   A girthing tape actually measures the girth (circumference) of the tree; the girthing tape is calibrated in divisions of π centimetres (3.14159 cm). The measure assumes the trunk has a circular cross-section and gives a directly converted reading of the diameter. [citation needed] It is accurate for most plantation trees. [according to whom?]