It is a multimeter with a clamp on facility to measure current using it as a current transformer.
a DC clamp meter works on the principals of what is called "Hall Effect." The meter creates a magnetic field, and the DC voltage passing through the wire interacts to crate a meter reading.
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that meter call AVO meter or digital clamp meter
A volt-ampere meter. You can read current in two basic ways. The harder but more accurate way is to break the line where you are measuring current and basically insert the meter into the line so all current flows through the meter. The other type is a "clamp on" meter where the meter has something like a claw that you open and encircle the wire you want to measure. You determine the current by induction. The current flowing through the wire induces a smaller current in a loop created by the clamp on device. You can only measure current in one wire at a time. For example, you couldn't just clamp over a lamp cord and read a correct current because you are encircling two wires and the current going in each direction cancel each other out.
Clamp meter according to the following link: http://wiki.answers.com/Q/How_do_you_measure_amperage&src=ansTT
basic principle of analogue clamp meter
CLAMP METER WORKS WITH THE PRINCIPLE OF HALL EFFECT..
Nutral wire can be measured by using clamp meter, if there is a current passing through the wire, we got a reading in the clamp meter i.e. 2A. If we clamp the earth wire by the clamp meter the reading will be zero.
a DC clamp meter works on the principals of what is called "Hall Effect." The meter creates a magnetic field, and the DC voltage passing through the wire interacts to crate a meter reading.
how to use the Clamp-On Meter Model GCM-600 to find the current of a DC power?
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Clamp the meter around the energized conductor that is connected to the load to be measured and read the amperage off of the dial face of the meter.
A clamp-on meter works by measuring the magnetic field set up around a conductor. Because the currents in the line and neutral conductors flow in opposite directions, their fields cancel and the clamp-on meter has nothing to monitor. So it must be placed around either the line OR the neutral conductor -not both!
Continuity tester, volt meter, clamp on amp meter, megger and ohm meter.
that meter call AVO meter or digital clamp meter
One can buy a used clamp meter at pawn shops and stores that sell home improvement supplies that are left over from construction jobs. There are several online sites that also sell used clamp meters.
For AC circuits, amperage is checked with a clamp on amp meter. There is now in the market place a clamp on amp meter that will work on both AC and DC circuits.