True RMS (TRMS) Measurements: Voltage up to 1000V AC/DC, Resistance, AC/DC Current, Frequency, Capacitance, Duty Cycle Optical isolated PC interface capability Crest (Peak hold), MAX, MIN MAX-MIN recording Auto and manual ranging Intelligent auto power off Data hold Relative zero mode Audible and visual warning against improper plug-in DC Loop Current 4-20mA dBm reading with 20 selectable impedance values Backlight display Large, easy to read large LCD display High speed analog bar graph Diode Test 4-20mA DC loop current Audible continuity Safety CAT IV 600V, CAT III 1000V > Each Unit Includes Test Leads Instruction Manual