Made of high-quality ABS insulating plastic, light and compact, easy to check the battery. The battery tester is used to test different types of household standard batteries (AA/AAA/C/D/ 1.5V/ 9V/1.5V button batteries or carbon, zinc and alkaline batteries), and is not suitable for rechargeable batteries. The tester is by the test battery, which prolongs the service life, can run without battery, and is economical and environmentally friendly. Fix the battery in the right position and the tester will start. Only the LCD screen is needed to identify the battery status. The red area is poor, the yellow area is weak and the blue area is good. A compact, portable and effective battery tester must be purchased for people who often use it. Name:Universal Digital Battery Tester Product battery:1.5V button cell (the product comes with it). Colour:As Shown Material:Plastic Package Contents: 1 * Universal digital battery tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.