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2. Current clamp - Wikipedia

   en.wikipedia.org/wiki/Current_clamp

   An electrical meter with integral AC current clamp is known as a clamp meter, clamp-on ammeter, tong tester, or colloquially as an amp clamp. A clamp meter measures the vector sum of the currents flowing in all the conductors passing through the probe, which depends on the phase relationship of the currents. Only one conductor is normally ...

3. Ammeter - Wikipedia

   en.wikipedia.org/wiki/Ammeter

   A DC ammeter is thus sensitive to which polarity it is connected in; most are marked with a positive terminal, but some have centre-zero mechanisms [a] and can display currents in either direction. A moving coil meter indicates the average (mean) of a varying current through it, [b] which is zero for AC. For this reason, moving-coil meters are ...

4. Multimeter - Wikipedia

   en.wikipedia.org/wiki/Multimeter

   Any meter will load the circuit under test to some extent. For example, a multimeter using a moving coil movement with full-scale deflection current of 50 microamps (μA), the highest sensitivity commonly available, must draw at least 50 μA from the circuit under test for the meter to reach the top end of its scale. This may load a high ...

5. Megger Group Limited - Wikipedia

   en.wikipedia.org/wiki/Megger_Group_Limited

   Wee Megger insulation tester Modern version of Megger insulation tester MIT520/2. Sydney Evershed (1858–1939) and Ernest Vignoles (1865–1948) bought the instrument section of Golden Trotter (where they both worked) and founded Evershed & Vignoles Limited on 5 February 1895. [2]

6. Avometer - Wikipedia

   en.wikipedia.org/wiki/Avometer

   No automatic protection. A smaller version similar in size to small portable test meters. (Basic ranges to 1 A, DC only and 1000 V, both extendable with external multiplier and shunts [23]). 10,000 ohms/volt DC, 1000 ohms/volt AC. Clamp meter: Principally for higher currents (Ranges 300 A, 600 A, 1200 A, 150 V, 300 V & 600 V all AC only).

7. Electricity meter - Wikipedia

   en.wikipedia.org/wiki/Electricity_meter

   An electricity meter, electric meter, electrical meter, energy meter, or kilowatt-hour meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically powered device over a time interval. Electric utilities use electric meters installed at customers' premises for billing and monitoring purposes.