What is the proper method for testing GFCI outlets?

The proper method for testing GFCI (Ground Fault Circuit Interrupter) outlets is to use the test button on the outlet itself. GFCI outlets are designed to detect imbalances between the incoming and outgoing current, which can indicate a ground fault. The test button simulates this condition by creating an imbalance, effectively prompting the GFCI to trip and cut off the power. This feature is crucial for ensuring the outlet is functioning correctly and can protect users from electrical shocks, enhancing safety.

In contrast, simply measuring voltage with a multimeter does not assess the GFCI's ability to interrupt the circuit under fault conditions. Checking for warm surfaces may indicate issues such as overheating or other problems but does not test the GFCI's operational integrity. Measuring current draw doesn't provide the necessary information on whether the GFCI will trip in an actual ground fault scenario, so it also doesn't fulfill the purpose of the test.