Electricians know that when you are measuring electrical installations there often appears to be a voltage, even if you know the wires are non-energized. This is called stray or ghost voltages and is caused by the capacity between the wires. Because of the very high impedance input of the meter, this stray voltage has nowhere to go, which will lead to an incorrect reading on the meter.
The Fluke TL225 makes sure the meter has a low input impedance that eliminates stray voltages. On energized wires, the meter will indicate the real voltage, on non-energized circuits the meter will read close to zero (even if there are stray voltages). The Fluke 225 can be used with all modern meters with standard input spacing and has a safety rating of CAT III 1000V and CAT IV 600V.
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