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  2. Measuring rod - Wikipedia

    en.wikipedia.org/wiki/Measuring_rod

    Graeco-Egyptian God Serapis with measuring rod. Gudea of Lagash with measuring rod and surveyors' tools. A measuring rod is a tool used to physically measure lengths and survey areas of various sizes. Most measuring rods are round or square sectioned; however, they can also be flat boards. Some have markings at regular intervals.

  3. Ruler - Wikipedia

    en.wikipedia.org/wiki/Ruler

    A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge, is an instrument used to make length measurements, whereby a user estimates a length by reading from a series of markings called "rules" along an edge of the device. [1] Usually, the instrument is rigid and the edge itself is a straightedge ...

  4. Genaille–Lucas rulers - Wikipedia

    en.wikipedia.org/wiki/Genaille–Lucas_rulers

    A complete set of Genaille–Lucas rulers, including an additional index rod. Genaille–Lucas rulers (also known as Genaille's rods) are an arithmetic tool invented by Henri Genaille, a French railway engineer, in 1891. The device is a variant of Napier's bones. By representing the carry graphically, the user can read off the results of simple ...

  5. Gauge (instrument) - Wikipedia

    en.wikipedia.org/wiki/Gauge_(instrument)

    a cylindrical ring of steel whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object. Strain gauge. a device used to measure the strain of an object. Thread pitch gauge, also called a threading gauge, pitch gauge, or screw gauge.

  6. Metre-stick - Wikipedia

    en.wikipedia.org/wiki/Metre-stick

    A meterstick divided into 1,000 mm and labeled with 100 cm. A metre-stick, metrestick, [1] or yardstick[2] is either a straightedge or foldable ruler used to measure length, and is especially common in the construction industry. They are often made of wood or plastic, and often have metal or plastic joints so that they can be folded together.

  7. Tape measure - Wikipedia

    en.wikipedia.org/wiki/Tape_measure

    Diagram showing fractions of an inch on a standard sixteenth measuring tape. A tape measure or measuring tape is a flexible ruler used to measure length or distance. It consists of a ribbon of cloth, plastic, fibre glass, or metal strip with linear measurement markings. It is a common measuring tool.

  8. Calipers - Wikipedia

    en.wikipedia.org/wiki/Calipers

    Depth probe, or depth rod: used to measure depths of an object (like a small beaker) or a hole. Main scale (metric) : marked every millimeter and helps to measure length correct up to 1 mm. Main scale (imperial) : marked in inches and fractions.

  9. Counting rods - Wikipedia

    en.wikipedia.org/wiki/Counting_rods

    sanchū. Counting rods (筭) are small bars, typically 3–14 cm (1" to 6") long, that were used by mathematicians for calculation in ancient East Asia. They are placed either horizontally or vertically to represent any integer or rational number. The written forms based on them are called rod numerals.

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