Short circuit detector for cars with 4 testing modes1、Application: Car electrical circuit tester suitable for all 12/24V car batteries, with 4 diagnostic modes, professional performance and reliable design to meet your usage needs. 2、Function: The diagnostic provides a comprehensive analysis of battery health to help you know the status of your battery in advance before it runs out. 3、Security Protection: Designed with reverse polarity protection, if the positive and negative polarity is reversed, it will not damage the device and will not affect the car or the battery. 4、Real Time Monitoring: The voltage of the car starting system and charging system can be monitored in real time to help users fully understand the data and characteristics of the car battery. 5、Accurate Diagnosis: Built in intelligent microprocessor, making the test fast and accurate, the test results can be displayed within two seconds, bringing you an excellent use experience.