Flir dm93 industrial true rms ac dc digital multimeter with vfd mode flir dm93 a true rms digital multimeter designed for heavy industrial use that features advanced vfd filtering that enables accurate voltage and frequency analysis of those non standard sine waves and noisy signals found in vfd controlled equipment to make using the multimeter easier a bright white led backlit display with analog bargraph is provided and powerful worklights light the test area in conditions of low light or