This battery tester does not require a power source, it can quickly determine whether the 1.5V battery, 9V battery is sufficient, the pointer directly displays the measurement result. It is simple but effective, this little battery tester checker has compact size, lightweight and easy to carry. The color indications of the meter are as follows: Red: If the indicator points to this block, the battery under test needs to be replaced or recharged, that is, the battery is basically unusable. Yellow: The battery is low, but still can be used in some appliances. Green: It means the battery is full. With color-coded analog readout to indicate power level, this battery tester is easy to read. It can be used to test different type of household batteries like AA, AAA, 1.5V and 9V button type. You can check the 9V battery by directly connecting to the two test holes on the side of the tester, pay attention to the positive and negative poles. For 1.5V AA and AAA batteries, please open test arm at the top of the tester with your hand, then insert the battery, pay attention to the positive and negative poles. Made of high-quality ABS and metal, this battery tester is durable. The length of this battery tester is 11.3cm, the width is 6cm, the height is 3cm. It is suitable for checking the electricity quantity of AA battery, AAA battery, 9V battery, etc. Item Name: Battery Tester Material:ABS,Metal Pointer Type Size:11.3cmx6cmx3cm/4.45inx2.36inx1.18in Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x Battery Tester