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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Description

🔧 Get wired with confidence!

🔒 SAFETY FIRST - CE CAT II 1000V certified for peace of mind during every test.
🕒 SMART SLEEP MODE - Automatic shutdown after 15 minutes of inactivity saves battery life.
💼 COMPACT PORTABLE - Lightweight design with a secure clip for on-the-go convenience.
🔍 NON CONTACT PRECISION - Experience effortless voltage detection without direct contact.
📏 DUAL RANGE MEASUREMENT - Switch between 48V-1000V and 12V-1000V for tailored testing.

The ZOTEK ZT-DB03 Voltage Tester is a versatile, non-contact tool designed for both professionals and DIY enthusiasts. With dual-range measurement capabilities, an integrated LED flashlight, and a compact design, it ensures accurate voltage detection up to 1000V while prioritizing user safety and convenience.

Specifications

Brand	ZOTEK
Power Source	Battery Powered
Style	Compact
Colour	Red
Item dimensions L x W x H	15.6 x 2.3 x 2.8 Centimeters
Min. Operating Voltage	12 Volts
Measurement Type	Voltage Tester
Maximum Operating Voltage	1000 Volts
UPC	787309234625
Manufacturer	ZOYI
Model number	ZT-DB03
Number of Memory Sticks	1
Item Weight	59 g
Product Dimensions	15.6 x 2.29 x 2.79 cm; 59 g
Batteries	2 AAA batteries required. (included)
Item model number	ZT-DB03
Item Height	1.1 Inches
Item Width	0.9 Inches
Included Components	Non-Contact Test Pen User Manual
Are batteries included?	Yes
Lithium Battery Packaging	Batteries only

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