JEGS 80716 Electrical Wire & Terminal Gauge is a reliable and accurate tool that will compliment any toolbox. This gauge allows you to measure wire and cable sizes from 250 MMC (Multi-Chip Module) to 20 AWG (American Wire Gauge), battery lugs, starter lugs, and posts sizes from #8 to 4/0. It also incorporates a built-in ruler that measures up to 7 inches and 180 mm. This tool is very convenient and manufactured from sturdy lightweight plastic that resists water, alcohol, oil, and grease. With its small size of 7 1/2 in. L x 3 in. W x 1/8 in. thick, this tool will fit in any toolbox.