20-Amp SmartlockPro Self-Test GFCI Testing a GFCI is a good way to verify that it is providing protection. While all GFCIs should be tested monthly, users often forget to conduct this test on a regular basis. Now there is a technology available that can supplement the manual testing and regularly conduct an automatic test of the circuit. In June of 2015 there was a revision to the UL (Underwriters Laboratory) standard 943 for Ground-Fault Circuit-Interrupters that improves safety for the end-user by requiring GFCI manufacturers to integrate an auto-monitoring (self-test) feature that performs a periodic test to confirm that the GFCI can respond to a ground-fault and, if not, it must visually and/or audibly indicate to the user that it needs to be replaced.