. This diagnostic tool is designed for automotive electrical testing and typically operates up to a maximum of 16 Volts. Mac Tools ET130 Auto Logic Probe Overview

Because official digital manuals for legacy Mac Tools products can be difficult to find directly on the manufacturer's site, most users refer to the physical instruction sheet included with the tool.

Based on standard automotive logic probe procedures found in related Mac Tools manuals:

: Attach the black clip to a known good ground (chassis or battery negative) and the red clip (if applicable) to the battery positive.