Which tool is primarily used to check voltage presence without contact?

A non-contact voltage tester is specifically designed to detect the presence of voltage without requiring physical contact with the electrical conductor. This tool senses the electric field generated by the voltage and provides a visual or audible indication of its presence. It is particularly useful for ensuring safety during electrical work, allowing technicians to quickly ascertain whether a wire or device is live before proceeding with further testing or repairs.

In contrast, an ohmmeter measures resistance in a circuit but does not check for voltage presence. A multimeter can test various electrical parameters, including voltage, but it typically requires connection to the circuit for accurate measurements rather than detecting voltage without contact. An ammeter, or amperemeter, measures current flow in a circuit and is not suitable for checking voltage at all. Each of these tools has its specific applications, but the non-contact voltage tester's unique capability makes it the best choice for checking voltage presence safely and efficiently.