Versatile 12V/24V battery tester that accurately tests batteries, alternators, and cranking systems for cars, trucks, motorcycles, ATVs, SUVs, boats, and yachts. Use it to verify electrical health and charging readiness, helping prevent unexpected failures and stalls. Wide testing range that fits common automotive needs: measures battery capacity from 100 to 2000 CCA with a clear digital display for easy reading in various lighting conditions. Multi function capabilities provide a complete picture: evaluates battery state of charge, voltage, resistance, and cranking/charging performance to determine overall health and reliability. Intuitive design for straightforward operation: simple interface with reset and enter buttons to streamline testing and reduce setup time. Practical use scenarios - At home before a long road trip: quickly check a car or truck battery and charging system to confirm adequate reserve capacity and charging performance. - On a boat or yacht: assess boat battery health and alternator output to ensure reliable start and electric systems during voyage. - In a shop or service bay: screen a used vehicle’s battery and cranking power to inform repair decisions and customer advisories.