The DOYLE™ 1000A AC/DC True-RMS Auto-Ranging Digital Clamp Meter combines True-RMS accuracy, a robust 1000 amp current capacity, and advanced HVAC testing functions for troubleshooting HVAC, automotive, and electrical systems. It has a simple-to-use interface with a large backlit display and professional-grade CAT IV 600V and CAT III 1000V safety ratings.