87V-MAX True-RMS Digital Multimeter, AC/DC Voltage, AC CurrentHeavy duty multimeter in a completely sealed, IP67 case True RMS AC voltage and current for accurate measurements on non linear signals Low pass filter for accurate voltage and frequency measurements on adjustable speed motor drives and other electrically noisy equipment Built in thermometer conveniently allows users to take temperature readings without having to carry a separate instrument Features large display digits and 2 level, bright white