Key ring with test pencil

The invention provides a key ring with a test pencil. The body of the key ring is provided with a voltage display screen, and the tail end is provided with a telescopic metal bar. When having some problems like sudden power interruption in daily life, a user can take down the key ring carried with him or her and then pull out the metal bar to conduct a simple voltage test, and thus great convenience is brought to the user. 本发明背供种带试电笔的钥匙扣，所述的钥匙扣的扣身设有电压显示屏，尾端带有个可伸缩的金属棒，当我们平时生活中遇到些突然断电的问题时，可以取下随身的钥匙扣，拨出金属棒来进行简单的电压测试，非常方便。