The FLIR DM92-NIST True RMS Industrial Multimeter, VFD Mode, NIST Certificate of Traceability 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 DM92's powerful lighting and durable design will make the job simple. The DM92-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.