True RMS DMM with 6,000 count large LCD display, temperature function and waterproof housing. The Extech EX520-NIST 11 Function Heavy Duty True RMS Industrial Multimeter with 6,000 count large LCD display, temperature function and waterproof housing is designed to withstand harsh environments and usage, the meter's rugged, double-molded housing is IP67-rated (waterproof and dustproof) and drop-tested to 6 ft. The large, illuminated LCD displays 4-digit readout (to 6,000 counts). The EX520 offers various must-have measurements and features 0.09 percent accuracy and a CAT IV 600-volt safety rating, protecting users even on outdoor wiring. It includes NIST Certification.