The Gossen Metrawatt METRAHIT 27EX-GMC-I is a high-performance digital multimeter with a unique combination of features that sets it apart from competitors: True RMS measurement: Accurately measures AC signals, even distorted waveforms. CAT IV 600 V safety rating: Ensures safe operation in high-voltage environments. Built-in insulation tester: Tests insulation resistance up to 1000 V. Large, backlit display: Provides clear and easy-to-read measurements.* Rugged construction: Withstands harsh conditions and drops.