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2. Pupilometer - Wikipedia

   en.wikipedia.org/wiki/Pupilometer

   In addition to having PD measured in a retail setting, a variety of web and mobile (Android and iOS) apps are now widely available. Web apps are used by a variety of online sellers of eyeglasses where an object of known size, such as a credit card, is needed to assist (size reference) the measurement process.

3. Positive displacement meter - Wikipedia

   en.wikipedia.org/wiki/Positive_displacement_meter

   Positive-displacement (PD) meters can measure both liquids and gases. Like turbine meters, PD flow meters work best with clean, non-corrosive, and non-erosive liquids and gases, although some models will tolerate some impurities. Because of their high accuracy, PD meters are widely used at residences to measure the amount of gas or water used.

4. Pupillary distance - Wikipedia

   en.wikipedia.org/wiki/Pupillary_distance

   Distance PD is the separation between the visual axes of the eyes in their primary position, as the subject fixates on an infinitely distant object. [2] Near PD is the separation between the visual axes of the eyes, at the plane of the spectacle lenses, as the subject fixates on a near object at the intended working distance. [3]

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6. Partial discharge - Wikipedia

   en.wikipedia.org/wiki/Partial_discharge

   The PD happens near the peak voltage both positive and negative. PD pulses are easy to measure using the high frequency current transducer (HFCT) method. The current transducer is clamped around the case ground of the component being tested. The severity of the PD is measured by measuring the burst interval between the end of a burst and the ...

7. Dimensional metrology - Wikipedia

   en.wikipedia.org/wiki/Dimensional_metrology

   Standardized measurements are essential to technological advancement, and early measurement tools have been found dating back to the dawn of human civilization. [1] Early Mesopotamian and Egyptian metrologists created a set of measurement standards based on body parts known as anthropic units. These ancient systems of measurements utilized ...