This phrase is commonly used in advertisements for used electronic equipment. It means that the equipment is guaranteed to work properly. The term, "DOA" is shorthand for, "Dead On Arrival".
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it means the products are tested and manufactured in Europe. If it has a UL label as well it was tested in the US. It is the European equivalent of UL. Note: the standards for CE are lower than those for UL!
Any test equipment that your life may depend on when using it must first be tested before being used. These types of test equipment usually have internal apparatus that can verify that the equipment is working perfectly before it is used by personnel. Linesmen use this type of test equipment before working on primary voltage lines.
Yes a 4 - 20 ma loop can be tested.
Back probe both wires of the sensor and use an AC voltage setting or your readings will be bad
In Canada, A fully certified electrician can make up to $35/hour.