The WUJUN battery tester is a convenient device designed to check the condition of various types of button cell batteries, including AA, AAA, C, D, 9V, and 1.5V. Its multi-size testing capability makes it an ideal solution for users who need to verify the state of their batteries in a single tool.

The WUJUN battery tester features a simple and intuitive design with clear markings on the buttons that indicate the battery type and level. The device is powered by no electricity, making it a great option for devices without a battery compartment or for those who prefer not to use batteries altogether. This unique feature allows users to test their batteries without damaging them.

The WUJUN battery tester is an affordable and easy-to-use solution that provides accurate results every time. Its compact size makes it perfect for small spaces, while its robust construction ensures durability. With a simple operation and clear user interface, this product is sure to become your go-to tool for checking and verifying the condition of button cell batteries. Whether you're a professional electrician or an enthusiast, this device is a must-have addition to your toolkit.