The FLIR DM93-NIST True RMS Industrial Multimeter with VFD Mode and Bluetooth world-class digital multimeter offers advanced variable frequency drive filtering to help you accurately analyze non-traditional sine waves and noisy signals. No matter what electrical challenge you're up against, the DM93's powerful lighting and durable design will make the job simple. The DM93-NIST offers additional features including Bluetooth technology to connect a compatible smartphone for remote viewing and sharing, and METERLiNK technology, to wirelessly embed electrical readings into radiometric infrared images on compatible FLIR thermal cameras.