The AMES INSTRUMENTS™ 600A T-RMS AC/DC Clamp Meter  is designed for professional technicians and electricians who need a fast responding clamp meter. This professional T-RMS AC/DC clamp meter provides a complete range of measuring functions for both HVAC and electrical applications. The thin jaw allows access to tight areas. The DC AMPS reading can be zeroed out before making a measurement by pushing the select button prior to making the measurement. CAT III 600v safety rated, independently tested by ETL.