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. AC/DC Current 600A, Jaw Opening: 26mm/1.0 in.. AC/DC Voltage: 600v. DC Amps zero function ability - simply push the select button prior to making the measurement. Resistance: 66M , Capacitance: 66mF, Frequency: 10 KHz. Display: 6600 Counts, Autoranging, Auto Power Off, Diode Test. Audible Continuity, Data Hold, Low Battery Indicator. Built in worklight. Inrush measurement (Motor starting current). Safety Rating: CAT III 600v.