The compact Extech 380947 is a 400A true RMS mini clamp meter. This meter features a small diameter clamp to reach small areas and offers 1mA resolution and very low current sensitivity. This mini clamp meter is useful for troubleshooting current and frequency related faults in facility maintenance, electrical installation, HVAC and telecommunications, as well as residential electrical installation, fleet maintenance and marine and motorcycle repairs. Includes battery and manual.