Convenient to measure: No need to waste time and energy on complicated tools. Simply attach the black wire to the negative pole of the battery and use the copper tipped pen to touch the positive pole. You will get a quick and reliable reading of your battery status. Portable and Comfortable: Our battery load tester has an ergonomic handle and a compact size, which makes it easy and comfortable to carry and to use. It has a simple design that allows you to test your battery quickly and accurately. 3 Indicator Lights: Indicator lights on the panel are your reliable guide to battery charge level. They display three colors of light (red, yellow, and green) that reflect the status of your battery and charging system. Because of this, you can easily spot and fix any problem. High Accuracy: This battery capacity tester provides accurate and reliable measurements of battery voltage and charging system status . It is equipped with a microcomputer control chip that promotes its precision. Keep the battery running normally: Undervoltage or overvoltage may cause damage or failure to your car. This voltage tester allows you to regularly test the battery and motor to avoid these problems. The normal operating voltage of the charging system is also displayed by this voltage tester.