Elit 1130054 is the Installer's Case No. III, combining three instruments in a fitted carry case for electrical service work. It bundles the ELIT 363 current clamp for non-invasive AC current measurement, the ELIT 919 digital multimeter for general voltage, resistance and continuity checks, and the ELIT 1560 digital insulation-resistance tester for verifying cable and machine insulation. The kit covers the core measurement tasks required for installation testing and fault-finding. Typical users are electricians undertaking commissioning, periodic inspection, or on-site troubleshooting.