does this work on Christmas lights

Yes, that is what I bought it for.

my tester quit after using for three days changed batteries the flashlight comes on and wont go off tester wil not work

Thank you very much for your feedback on using the DB03 product. Your information is very important to us. If you encounter the fault you mentioned, you can try the following operations: 1. Check whether the safety key is stuck and whether other safety key functions can work normally; 2. Check whether the battery size is too large, which may cause internal structure deformation; 3. After confirming the above two points, you can try to turn off and restart the device.

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描述

🔧 Power Up Your Safety Game!

🔔 ALERTS YOU - Audible beeps and LED indicators keep you informed of live wires.
🔌 SAFETY FIRST - Non-contact voltage detection ensures you stay safe while working.
🌙 ILLUMINATE YOUR WORK - Built-in LED flashlight makes testing in dark spaces a breeze.
👜 COMPACT CONVENIENT - Lightweight design with a clip for easy portability on the go.
📏 VERSATILE VOLTAGE RANGE - Accurately detects voltages from 12V to 1000V for all your testing needs.

The ZOYI ZT-DB03 AC Voltage Detector is a non-contact voltage tester pen designed for both household and industrial use. It detects voltage ranges from 12V to 1000V, ensuring safety with audible and visual alerts. The built-in LED flashlight enhances usability in low-light conditions, while its compact design makes it easy to carry for all your electrical testing needs.