Easy to use: the digital display immediately indicates the battery level. There is a summary table on the back of the product. Compared to the numbers on the back, you can see the performance of all battery types at a glance. Easy to use: activated by tested battery, no battery required for operation, adjustable slide control, the battery tester is compatible with most batteries and button cells. Accurate data: the digital battery tester is faster and more accurate than the ordinary battery tester, without waiting. Easy to carry: simple but effective small battery tester , compact size and lightweight, easy to carry. Multiple uses: can be used to test different types of household batteries, such as AA, AAA, C, D, 9V, 1.5V, 18650, button batteries. Note: the data are all manual measurement, please allow 1 - 12cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received.