OTC 3181 130 Amp Heavy-Duty Battery Load Tester Ergonomically designed heavy-duty battery tester provides accurate reliable test results in just 10 seconds Includes uniquely designed clamps for a positive grip on top and side post batteries and an extra large Extra large display with zero adjust Works on both 6V and 12V batteries Side tabs for on-tool clamp storage and back brackets for tool storage on wall or toolbox