The FLIR DM91 True RMS Industrial Multimeter with Datalogging and Connectivity is a safe and reliable digital multimeter for a wide range of electrical and electronic system applications. With durable design, intuitive user interfaces, and comprehensive features covering high and low voltage applications, the DM91 is uniquely positioned to help you troubleshoot electrical, electronic and HVAC/R systems. The DM91 is also enhanced with Bluetooth technology, so that you can connect via METERLiNK to FLIR infrared cameras, or to mobile devices running FLIR Tools, or the FLIR InSiteTM workflow management system.