FLIR DM93 Industrial Digital Multimeter with LoZ and VFD Filter VFD Mode filters variable frequency drive signals and provides accurate voltage and frequency measurements during maintenance and troubleshooting LoZ Mode eliminates ghost voltage readings associated with long-run applications Powerful Worklights eliminate the need for a flashlight while performing tests in dim lighting Data Record feature captures electrical measurements and provides wireless data transfer Integrated Bluetooth technology connects the FLIR DM93 to the FLIR Tools Mobile app on your compatible mobile device