Fluke 28-II True-RMS Rugged IP 67 Industrial Digital Multimeter with a NIST-Traceable Calibration Certificate with Data Your unit is calibrated prior to shipment with a new nist-traceable calibration Certificate with data The NIST calibration provides you assurance your instrument Meets manufacturers specifications. Your instrument is ready to Use day one meeting most quality system standards Hi resolution 20,000 count display mode True-rms AC Voltage and current for accurate measurements on Non linear signals Backlit keypad buttons allow for easy visibility in low-lit areas