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2. Conductivity (electrolytic) - Wikipedia

   en.wikipedia.org/wiki/Conductivity_(electrolytic)

   [citation needed] The resistance is measured by a conductivity meter. Typical frequencies used are in the range 1–3 kHz. The dependence on the frequency is usually small, [5] but may become appreciable at very high frequencies, an effect known as the Debye–Falkenhagen effect. A wide variety of instrumentation is commercially available. [6]

3. Siemens (unit) - Wikipedia

   en.wikipedia.org/wiki/Siemens_(unit)

   The siemens (symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively; hence one siemens is equal to the reciprocal of one ohm (Ω −1) and is also referred to as the mho.

4. Meter serial number - Wikipedia

   en.wikipedia.org/wiki/Meter_serial_number

   There are a variety of formats used over many years, but many meter serial numbers take the form A##AA##### (e.g. S06DS123456). The first letter indicates the manufacturer, the first two digits indicate the year the meter was calibrated and certified, and the second letter (or pair of letters) indicates the company that purchased the meter.

5. Galvanometer - Wikipedia

   en.wikipedia.org/wiki/Galvanometer

   Probably the largest use of galvanometers was of the D'Arsonval/Weston type used in analog meters in electronic equipment. Since the 1980s, galvanometer-type analog meter movements have been displaced by analog-to-digital converters (ADCs) for many uses. A digital panel meter (DPM) contains an ADC and numeric display.

6. Multimeter - Wikipedia

   en.wikipedia.org/wiki/Multimeter

   The meter comprised a moving coil meter, voltage and precision resistors, and switches and sockets to select the range. The first Avometer had a sensitivity of 60 Ω/V, three direct current ranges (12 mA, 1.2 A, and 12 A), three direct voltage ranges (12, 120, and 600 V or optionally 1,200 V), and a 10,000 Ω resistance range.

7. Siemens - Wikipedia

   en.wikipedia.org/wiki/Siemens

   Siemens is the largest industrial manufacturing company in Europe, [7] and holds the position of global market leader in industrial automation and industrial software. [8] The origins of the conglomerate can be traced back to 1847 to the Telegraphen Bau-Anstalt von Siemens & Halske established in Berlin by Werner von Siemens and Johann Georg ...